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New paper published in J. Open Res. Softw.
Published:
Our article, “Atomize: A Modular Software for Control and Automation of Scientific and Industrial Instruments” was published online today, 07-11-2025, in Journal of Open Research Software. Check it out.
Atomize is a modular software designed to control a wide range of scientific and industrial instruments, integrate them into a unified multifunctional setup, and automate routine experimental work. The software consists of a collection of Python libraries for different apparatus and general-purpose functions, including user-friendly functions for data visualization and storage. All of this, combined with a graphical user interface and the possibility of performing test runs to check the logic of the experiment without access to the devices used, provides a high degree of flexibility and usability, even without significant programming experience. Atomize is freely available on GitHub, and we encourage researchers, engineers, students, and developers working in any field of science and technology to use it in their work.
New paper published in J. Chem. Phys.
Published:
Our article, “Application of pulsed heating in time-resolved EPR spectroscopy for longitudinal relaxation measurements” was published online today, 25-10-2025, in The Journal of Chemical Physics as featured article. Check it out.
Transient or time-resolved electron paramagnetic resonance spectroscopy (TR EPR) is a powerful method for studying various photogenerated paramagnetic species. The use of low-energy quanta, such as terahertz (THz) radiation, as an external stimulus in TR EPR allows the initiation of spin dynamics without generating new paramagnetic species other than those already present in the system. This spin dynamic reflects the return of the system to thermodynamic equilibrium, governed by a spin–lattice relaxation time, T1. The latter, together with a phase memory time, is of paramount importance for the practical implementation of single-molecule magnets and molecular spin qubits. In this work, we present TR EPR spectroscopy with pulsed heating by THz pulses as a versatile spectroscopic method for determining T1 in a wide range of paramagnetic systems. To define the scope of the method, we developed a numerical model based on the Liouville–von Neumann equation, with the equilibrium density matrix defined by the temperature profile of the lattice. Using experimental data obtained for [CoTp2] (cobalt(II) bis[tris(pyrazolyl)borate]) with S = 3/2, we compared the proposed method with two other commonly used techniques: alternating current (AC) magnetometry and pulsed EPR. All three methods were found to be in qualitative agreement and provided complementary information about the relaxation properties. TR EPR spectroscopy showed the orientation dependence of T1. AC magnetometry revealed the dependence of T1 on the value of the external magnetic field, which was attributed in the literature to a field-induced Raman process. Finally, pulsed EPR spectroscopy was found to be biased by strong spectral diffusion.
New paper published in Angew. Chem. Int. Ed.
Published:
Our article, “Thermomagnetic Bistability, Colossal Negative Thermal Expansion, and THz-Heat-Induced Switching in Cu-Nitroxide Complex” was published online today, 08-10-2025, in Angewandte Chemie International Edition. Check it out.
Bistability in molecule-based magnets is crucial for their applications in functional devices, and thermally induced excited spin state trapping (TIESST) represents a promising route to maintain two distinct spin states for a significant period of time. Heterospin compounds based on Cu(II) and nitroxide radicals demonstrate highly tunable non-classical spin transitions, nevertheless they did not reveal TIESST effects up to date. Here, we report the first Cu(II)-nitroxide complex that exhibits TIESST-driven bistability up to 116 K. The TIESST temperature is close to temperatures of the spin transition, which is accompanied by a hysteresis of 30 K (T1/2↑ = 144 K, T1/2↓ = 114 K). The trapped excited state features a very slow relaxation that exceeds 9 h at 95 K. Fast switching is also feasible for this complex: almost complete conversion from the ground to excited state occurs in a single THz pulse within 50 ms. The slow relaxation and preservation of the crystal quality enabled us to perform an XRD study and demonstrate that the trapped and stable phases coexist during the transition. It was demonstrated, that relaxation of excited state proceeds via an autocatalytic mechanism, previously unreported for spin-crossover systems, which introduces a new paradigm in spin relaxation dynamics.
New paper published in Appl. Magn. Res.
Published:
Our article, Monitoring S = 0 ↔ S = 2 Spin-State Switching in Fe(II) Complex Using FT EPR and Trityl Radical as Local Magnetic Field Sensor” was published online today, 02-10-2025, in Applied Magnetic Resonance. Check it out.
The use of EPR spectroscopy for studying spin crossover (SCO) is often limited due to the fact that a large number of complexes do not have an EPR signal in X- and Q-bands. At the same time, EPR spectroscopy, being insensitive to diamagnetic impurities and having excellent sensitivity to paramagnetic centers, provides unique advantages compared to direct current magnetometry. In this paper, we propose a method for detecting the thermal spin transition in a spin crossover Fe(II)-based complex by pulsed EPR in the direct dimension with a specially designed spin-probe. The spin probe is non-contact and reusable, consisting of an ampoule of 1 mm diameter filled with a Finland triarylmethyl radical. To detect the SCO transition, the probe is surrounded by a powder of the SCO complex under investigation. In such a design, the transition can be observed through the shift of the line in the EPR spectrum of the spin probe. The latter occurs due to an addition to the external magnetic field of the spectrometer caused by the transition of the spin crossover complex to a high-spin state, in which it demonstrates paramagnetic properties. The experimental results showed that the proposed method allows one to register a transition in [FeL2][BF4]2 complex, where L is 2,6-di(pyrazol-1-yl)pyridine, in the temperature range of 260–262 K with a 2 K wide hysteresis. The change in the local magnetic field at the location of the spin probe of about 0.004 mT was registered, which is in agreement with the numerical calculations performed.
New paper published in J. Appl. Phys.
Published:
Our article, “Inter-Kramers electric quadrupole transitions in high-spin systems induced by resonant alternating inhomogeneous electric field” was published online today, 24-09-2025, in The Journal of Applied Physics (Vol.138, Issue 12). Check it out.
This study presents a theoretical analysis of the interaction of high-spin systems with inhomogeneous alternating electric field and homogeneous alternating magnetic field that induce electric quadrupole (QT, E2) and magnetic dipole transitions (MT, M1), respectively. In order to distinguish QTs from MTs, an analytical expression for the intensities and selection rules for a model system with a half-integer total spin S = 3/2 was derived using the spin Hamiltonian and operator-equivalent approaches. The direct comparison of the absorption patterns for the QT and MT of a model high-spin Co(II) system was performed in a frequency domain corresponding to Frequency Domain Fourier Transform Terahertz Electron Paramagnetic Resonance spectroscopy. This type of systems often exhibits the properties of a single molecular magnet at helium temperatures and is characterized by a large zero field splitting. Despite more flexible selection rules for electric quadrupole transitions, the powder spectra of QT and MT were shown to be similar, emphasizing the need for precise spectral measurements to determine the dominant transition type in high-spin systems. The approach developed in the paper not only solves a rather complex quantum mechanical problem that includes the estimation of the quadrupole moment of unpaired electrons, but also demonstrates a possible way for advanced manipulation of spin states, a capability crucial for the development of quantum computing and information storage technologies.
portfolio
publications
The influence of coordination compounds on spin chemical processes in irradiated hydrocarbons
Published in Doklady Physical Chemistry, 2012
In this paper, we studied the effect of a coordination compound introduced into the sample on the MARY spectrum of a radical ion pair with known properties
Recommended citation: Sergey N.V., Stass D.V., Burdukov A.B., Melnikov A.R., Molin Y.N. "The influence of coordination compounds on spin chemical processes in irradiated hydrocarbons" Dokl. Phys. Chem. 2012. 442(1). P. 12-15.
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A Low-Field Magnetically Affected Reaction Yield (MARY) Spectrometer with Spectral Fluorescence Resolution
Published in Applied Magnetic Resonance, 2012
In this paper, a novel spectrometer for low-field studies in magnetically affected reaction yield (MARY) spectroscopy with fluorescence detection is described
Recommended citation: Kalneus E.V., Melnikov A.R., Korolev V.V., Ivannikov V.I., Stass D.V. "A Low-Field Magnetically Affected Reaction Yield (MARY) Spectrometer with Spectral Fluorescence Resolution" Appl. Magn. Res. 2013. 44(1). P. 81-96.
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Registration of radical anions of Al, Ga, In tris-8-oxyquinolinates by magnetosensitive and spectrally resolved recombination luminescence in benzene solutions
Published in Chemical Physics Letters, 2012
In this paper, we studied the formation and recombination of transient radical anions of Al, Ga, and In tris-8-oxyquinolinates
Recommended citation: Sergey N.V., Verkhovlyuk V.N., Kalneus E.V., Korolev V.V., Melnikov A.R., Burdukov A.B., Stass D.V., Molin Y.N. "Registration of radical anions of Al, Ga, In tris-8-oxyquinolinates by magnetosensitive and spectrally resolved recombination luminescence in benzene solutions" Chem. Phys. Lett. 2012. 442. P. 32-37.
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Exciplex formation upon recombination of radiation-generated radical ion pairs in nonpolar solutions
Published in Doklady Physical Chemistry, 2013
In this work, we studied photo and radiation induced luminescence spectra of solutions of some donor–acceptor systems widely used in the radiation spin chemistry experiments, in particular, anthracene-DMA, p-terphenyl-DMA, and similar systems
Recommended citation: Melnikov A.R., Kalneus E.V., Korolev V.V., Dranov I.G., Stass D.V. "Exciplex formation upon recombination of radiation-generated radical ion pairs in nonpolar solutions" Dokl. Phys. Chem. 2013. 452(2). P. 257-260.
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Stimulation of luminescence of mycelium of luminous fungus Neonothopanus nambi by ionizing radiation
Published in Luminescence, 2014
In this work, we report the effect of X-irradiation on the luminescence of fungus Neonothopanus nambi. Application of X-rays does not change the emission spectrum, but after approximately 20 min of continuous irradiation, light production from unsupported mycelium starts growing
Recommended citation: Kobzeva T.V., Melnikov A.R., Karogodina T.Y., Zikirin S.B., Stass D.V., Molin Y.N., Rodicheva E.K., Medvedeva S.E., Puzyr A.P., Burov A.A., Bondar V.S., Gitelson J.I. "Stimulation of luminescence of mycelium of luminous fungus Neonothopanus nambi by ionizing radiation" Luminescence. 2014. 29(7). P. 703-710.
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Highly efficient exciplex formation via radical ion pair recombination in X-irradiated alkane solutions for luminophores with short fluorescence lifetimes
Published in Photochemical Photobiological Sciences, 2014
In this paper, we shows a possibility of exciplex formation via irreversible recombination of radical ion pairs generated by X-irradiation of alkane solutions of N,N-dimethylaniline with various organic luminophores
Recommended citation: Melnikov A.R., Kalneus E.V., Korolev V.V., Dranov I.G., Kruppa A.I., Stass D.V. "Highly efficient exciplex formation via radical ion pair recombination in X-irradiated alkane solutions for luminophores with short fluorescence lifetimes" Photochem. Photobiol. Sci. 2014. 13(8). P. 1169-1179.
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Effect of ionizing radiation on the luminescence of mycelium of luminous fungus Neonothopanus nambi
Published in Biochemistry, Biophysics and Molecular Biology, 2014
In this paper, we report the effect of X-irradiation on the luminescence of fungus Neonothopanus nambi
Recommended citation: Bondar V.S., Puzyr A.P., Burov A.E., Medvedeva S.E., Rodicheva E.K., Kobzeva T.V., Melnikov A.R., Karogodina T.Y., Zikirin S.B., Stass D.V., Molin Y.N., Gitelson J.I. "Effect of ionizing radiation on the luminescence of mycelium of luminous fungus Neonothopanus nambi" Dokl. Biochem. Biophys. 2015. 460(1). P. 30-33.
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Estimation of the fluorescence lifetime for optically inaccessible exciplexes in nonpolar solutions under ionizing irradiation
Published in Photochemical Photobiological Sciences, 2016
In this paper, we present a simple and universal experimental approach for the estimation of fluorescence lifetimes of X-radiation generated exciplexes
Recommended citation: Melnikov A.R., Kalneus E.V., Korolev V.V., Sherin P.S., Borovkov V.I., Stass D.V. "Estimation of the fluorescence lifetime for optically inaccessible exciplexes in nonpolar solutions under ionizing irradiation" Photochem. Photobiol. Sci. 2016. 15(6). P. 767-778.
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Estimation of the Fraction of Spin-Correlated Radical Ion Pairs in Irradiated Alkanes using Magnetosensitive Recombination Luminescence from Exciplexes Generated upon Recombination of a Probe Pair
Published in Zeitschrift für Physikalische Chemie, 2016
This paper describes the magnitude of magnetic field effects in exciplex emission formed by a novel acceptor-substituted diphenylacetylene and DMA
Recommended citation: Melnikov A.R., Verkhovlyuk V.N., Kalneus E.V., Korolev V.V., Borovkov V.I., Sherin P.S., Davydova M.P., Vasilevsky S.F., Stass D.V. "Estimation of the Fraction of Spin-Correlated Radical Ion Pairs in Irradiated Alkanes using Magnetosensitive Recombination Luminescence from Exciplexes Generated upon Recombination of a Probe Pair" Z. Phys. Chem. 2016. 231(2). P. 239-267.
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A comparative study of optical properties and X-ray induced luminescence of octahedral molybdenum and tungsten cluster complexes
Published in Dalton Transactions, 2017
This paper compares photoluminescence, radiodensity and X-ray induced luminescence properties of eight related octahedral molybdenum and tungsten cluster complexes
Recommended citation: Evtushok D.V., Melnikov A.R., Vorotnikova N.A., Vorotnikov Y.A., Ryadun A.A., Kuratieva N.V., Kozyr K.V., Obedinskaya N.R., Kretov E.I., Novozhilov I.N., Mironov Y.V., Stass D.V., Efremova O.A., Shestopalov M.A. "A comparative study of optical properties and X-ray induced luminescence of octahedral molybdenum and tungsten cluster complexes" Dalton Trans. 2017. 46(35). P. 11738-11747.
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Comparison of exciplex generation under optical and X-ray excitation
Published in The Journal of Chemical Physics, 2017
In this work, we propose a model for describing exciplex formation under X-ray radiation
Recommended citation: Kipriyanov A.A., Melnikov A.R., Stass D.V., Doktorov A.B. "Comparison of exciplex generation under optical and X-ray excitation" J. Chem. Phys. 2017. 147(9). Art. Num. 094102.
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X-ray Generated Recombination Exciplexes of Substituted Diphenylacetylenes with Tertiary Amines: A Versatile Experimental Vehicle for Targeted Creation of Deep-Blue Electroluminescent Systems
Published in The Journal of Physical Chemistry A, 2018
In this work, we show that recombination exciplexes of simple substituted diphenylacetylenes with tertiary amines can be a convenient source of tunable deep-blue emission with possible applications in organic electroluminescent systems
Recommended citation: Melnikov A.R., Davydova M.P., Sherin P.S., Korolev V.V., Stepanov A.A., Kalneus E.V., Benassi E., Vasilevsky S.F., Stass D.V. "X-ray Generated Recombination Exciplexes of Substituted Diphenylacetylenes with Tertiary Amines: A Versatile Experimental Vehicle for Targeted Creation of Deep-Blue Electroluminescent Systems" J. Phys. Chem. A. 2018. 122(5). P. 1235-1252.
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Determination of Hyperfine Coupling Constants of Fluorinated Diphenylacetylene Radical Anions by Magnetic Field-Affected Reaction Yield Spectroscopy
Published in The Journal of Physical Chemistry A, 2018
In this work, the radical anions of two fluorinated diphenylacetylene derivatives with nonequivalent magnetic nuclei and unknown hyperfine coupling constants were investigated by MARY spectroscopy
Recommended citation: Sannikova V.A., Davydova M.P., Sherin P.S., Babenko S.V., Korolev V.V., Stepanov A.A., Nikul’shin, P.V., Kalneus E.V., Vasilevsky S.F., Benassi E., Melnikov A.R. "Determination of Hyperfine Coupling Constants of Fluorinated Diphenylacetylene Radical Anions by Magnetic Field-Affected Reaction Yield Spectroscopy" J. Phys. Chem. A. 2019. 123(2). P. 505-516.
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Water-soluble Re6-clusters with aromatic phosphine ligands – from synthesis to potential biomedical applications
Published in Inorganic Chemistry Frontiers, 2019
We present the syntheses of two new water-soluble hexarhenium cluster complexes with terminal amphiphilic phosphine ligands, and delineate their photoluminescence and X-ray excited optical luminescence (XEOL) properties
Recommended citation: Ivanov A.A., Konovalov D.I., Pozmogova T.N., Solovieva A.O., Melnikov A.R., Brylev K.A., Kuratieva N.V., Yanshole V.V., Kirakci K., Lang K., Cheltygmasheva S.N., Kitamura N., Shestopalova L.V., Mironov Y.V., Shestopalov M.A. "Water-soluble Re6-clusters with aromatic phosphine ligands – from synthesis to potential biomedical applications" Inorg. Chem. Front. 2019. 6(4). P. 882-892.
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Electronic Modulation of THz Radiation at NovoFEL: Technical Aspects and Possible Applications
Published in Journal of Inclusion Phenomena and Macrocyclic Chemistry, 2019
In this work, we describe a pulsed mode of radiation generation for the NovoFEL
Recommended citation: Shevchenko O.A., Melnikov A.R., Tararyshkin S.V., Getmanov Y.V., Serednyakov S>S., Bykov E.V., Kubarev V.V., Fedin M.V., Veber S.L. "Electronic Modulation of THz Radiation at NovoFEL: Technical Aspects and Possible Applications" Materials. 2019. 12(19). Art. Num. 3063
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Electronic Modulation of the FEL-Oscillator Radiation Power Driven by ERL
Published in Proceedings of the 39th International Free-Electron Laser Conference, FEL 2019, 2019
In this work, we propose a simple way of fast control of the FEL lasing which is based on periodic phase shift of electron bunches with respect to radiation stored in optical cavity
Recommended citation: Shevchenko O.A., Bykov E.V., Fedin M.V., Getmanov Y.V., Melnikov A.R., Serednyakov S.S., Tararyshkin S.V., Veber S.L. "Electronic Modulation of the FEL-Oscillator Radiation Power Driven by ERL" Proc. FEL’19. 2019. 39. P. 98-101.
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Exploring the reactivity of b-cyclodextrin-encapsulated anthraquinone-2,6-disulfonate
Published in Journal of Inclusion Phenomena and Macrocyclic Chemistry, 2020
The intracomplex reaction of anthraquinone-2,6-disulfonate in triplet excited state with beta-cyclodextrin and the reaction of 3AQDS:CD complex with external quencher, N-Acetyl-l-Tyrosine, have been studied using laser flash photolysis, 1H NMR and 1H CIDNP
Recommended citation: Babenko S.V., Melnikov A.R., Tsentalovich Y.P., Kruppa A.I. "Exploring the reactivity of b-cyclodextrin-encapsulated anthraquinone-2,6-disulfonate." J. Incl. Phenom. Macro. 2020. 97(1). P. 121-127.
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The Radiation Beamline of Novosibirsk Free-Electron Laser Facility Operating in Terahertz, Far-Infrared, and Mid-Infrared Ranges
Published in IEEE Transactions on Terahertz Science and Technology, 2020
In this work, we describe the 120-m beamline for transporting the radiation of the Novosibirsk FEL facility, consisting of three FELs of the terahertz (THz), far-infrared, and mid-infrared ranges
Recommended citation: Kubarev V.V., Sozinov G.I., Scheglov M.A., Vodopyanov A.V., Sidorov A.V., Melnikov A.R., Veber S.L. "The Radiation Beamline of Novosibirsk Free-Electron Laser Facility Operating in Terahertz, Far-Infrared, and Mid-Infrared Ranges." IEEE Trans. Terahertz Sci. Technol. 2020. 10(6). P. 634-646.
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Technical and software improvements of the EPR spectroscopy endstation at the NovoFEL facility: Status 2020
Published in AIP Conference Proceedings, 2020
In this work, the current status (2020) of the EPR endstation at the NovoFEL facility is described
Recommended citation: Melnikov A.R., Kiskin M.A., Getmanov Y.V., Shevchenko O.A., Fedin M.V., Veber S.L. "Technical and software improvements of the EPR spectroscopy endstation at the NovoFEL facility: Status 2020." AIP Conf. Proc. 2020. 2299(1). Art. Num. 030010.
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Broadband multimodal THz waveguides for efficient transfer of high-power radiation in space-confined conditions
Published in Optics & Laser Technology, 2021
In this work, we present the design and fabrication of multimodal hollow THz waveguides used at the X-band Electron Paramagnetic Resonance endstation of the Novosibirsk Free Electron Laser facility
Recommended citation: Melnikov A.R., Samsonenko A.A., Getmanov Y.V., Shevchenko O.A., Shevchenko D.A., Stepanov A.A., Fedin M.V., Yurkin M.A., Veber S.L. "Broadband multimodal THz waveguides for efficient transfer of high-power radiation in space-confined conditions." Opt. Laser Technol. 2021. 143. Art. Num. 107375.
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Application of Pyroelectric Sensors Based on PVDF Films for EPR Spectra Detection by Heat Release
Published in Sensors, 2021
This paper presents the use pyroelectric film sensors for detecting EPR signals
Recommended citation: Melnikov A.R., Zikirin S.B., Kalneus E.V., Ivannikov V.I., Grishin Y.A., Anisimov O.A. "Application of Pyroelectric Sensors Based on PVDF Films for EPR Spectra Detection by Heat Release." Sensors. 2021. 21(24). Art. Num. 8426.
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Temperature dynamics of magnetoactive compounds under terahertz irradiation: characterization by an EPR study
Published in Russian Chemical Bulletin, 2022
In this paper, we studied effects of powerful terahertz radiation on the spin state of Cu(II) based paramagnetic system
Recommended citation: Tumanov S.V., Melnikov A.R., Artiukhova N.A., Bogomyakov A.S., Shevchenko O.A., Getmanov Y.V., Ovcharenko V.I., Fedin M.V., Veber S.L. "Temperature dynamics of magnetoactive compounds under terahertz irradiation: characterization by an EPR study." Russ. Chem. Bull. 2022. 71(7). P. 1378-1384.
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The role of Heisenberg spin exchange and the quantum Zeno effect in the spin-selective reaction between spin-1/2 and spin-1 particles
Published in The Journal of Chemical Physics, 2022
This theoretical paper describes a kinetic model of the irreversible reaction between the spin-1/2 and spin-1 particles in an encounter complex with the reactive doublet state
Recommended citation: Bagryansky V.A., Melnikov A.R., Molin Y.N., Borovkov V.I. "The role of Heisenberg spin exchange and the quantum Zeno effect in the spin-selective reaction between spin-1/2 and spin-1 particles." J. Chem. Phys. 2023. 157(6). Art. Num. 064306.
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A broadband pulse EPR spectrometer for high-throughput measurements in the X-band
Published in Journal of Magnetic Resonance Open, 2022
This paper describes a homemade X-band pulsed EPR spectrometer
Recommended citation: Isaev N.P., Melnikov A.R., Lomanovich K.A., Dugin M.V., Ivanov M.Y., Polovyanenko D.N., Veber S.L., Bowman M.K., Bagryanskaya E.G. "A broadband pulse EPR spectrometer for high-throughput measurements in the X-band." J. Magn. Res. Open. 2022. 14-15. Art. Num. 100092.
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Sensitivity optimization in pulse EPR experiments with photo-labels by multiple-echo-integrated dynamical decoupling
Published in Physical Chemistry Chemical Physics, 2023
In this paper, we demonstrate that the use of Carr–Parcel–Meiboom–Gill blocks followed by multiple echo integration is a promising route for sensitivity gain in pulsed EPR utilizing photo-excited triplet states
Recommended citation: Sannikova N.E., Melnikov A.R., Veber S.L., Krumkacheva O.A., Fedin M.V. "Sensitivity optimization in pulse EPR experiments with photo-labels by multiple-echo-integrated dynamical decoupling." Phys. Chem. Chem. Phys. 2023. 25(17). P. 11971-11980.
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Comparative Study of Single Crystal and Polymeric Pyroelectric Detectors in the 0.9–2.0 THz Range Using Monochromatic Laser Radiation of the NovoFEL
Published in Polymers, 2023
This work compares the performance of six different detectors, based on either LaTiO3 crystal or different polymeric films, using monochromatic radiation of the Novosibirsk Free Electron Laser facility (NovoFEL) in the frequency range of 0.9–2.0 THz
Recommended citation: Melnikov A.R., Kalneus E.V., Getmanov Y.V., Shevchenko D.A., Gerasimov V.V., Anisimov O.A., Fedin M.V., Veber S.L. "Comparative Study of Single Crystal and Polymeric Pyroelectric Detectors in the 0.9–2.0 THz Range Using Monochromatic Laser Radiation of the NovoFEL." Polymers. 2023. 15(20). Art. Num. 4124.
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Photophysics and Photochemistry of Nickel(II) Diselenophosphinate in CCl4
Published in High Energy Chemistry, 2023
The nature of the photoprocess of Nickel(II) Diselenophosphinate in CCl4 were determined y the EPR, steady-state and time-resolved optical spectroscopy methods
Recommended citation: Mikheylis A.V., Grivin V.P., Pozdnyakov I.P., Melnikov A.A., Melnikov A.R., Sadykov E.Kh., Artem’ev A.V. "Photophysics and Photochemistry of Nickel(II) Diselenophosphinate in CCl4." High Energy Chem. 2023. 57(3). P. S433-S440.
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Inductive detection of temperature-induced magnetization dynamics of molecular spin systems
Published in The Journal of Chemical Physics, 2024
In this paper, we proposed an inductive detection of temperature-induced magnetization dynamics as applied to the study of molecular spin systems and describe the general design and construction of an induction probehead
Recommended citation: Melnikov A.R., Ivanov M.Y., Samsonenko A.A., Getmanov Y.V., Nikovskiy I.A., Matiukhina A.K., Zorina-Tikhonova E.N., Voronina J.K., Goloveshkin A.S., Babeshkin K.A., Efimov N.N., Kiskin M.A., Eremenko I.L., Fedin M.V., Veber S.L. "Inductive detection of temperature-induced magnetization dynamics of molecular spin systems ." J. Chem. Phys. 2024. 160(22). Art. Num. 224201.
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Calculation of π Using a Molecular Electron Spin Qubit Implemented by Pulsed Electron Paramagnetic Resonance
Published in The Journal of Physical Chemistry Letters, 2024
This paper describes an interesting method to compare the performance of different mocelular electron spin qubits
Recommended citation: Borodulina A.V., Melnikov A.R., Bochkin G.A., Fedin M.V., Fel’dman, E.B., Veber S.L. "Calculation of π Using a Molecular Electron Spin Qubit Implemented by Pulsed Electron Paramagnetic Resonance." J. Phys. Chem. Lett. 2024. 15(31). P. 8026-8031.
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Scalable Approach for Grafting Qubit Candidates onto the Surface of MOF-808 Framework
Published in Russian Journal of Coordination Chemistry, 2024
In this work a simple and scalable approach to obtain qubit candidates based on stable organic radical 3-carboxy-proxyl and MOF-808 framework was demonstrated
Recommended citation: Tomilov A.S., Yazikova A.A., Melnikov A.R., Smirnova K.A., Poryvaev A.S., Fedin M.V. "Scalable Approach for Grafting Qubit Candidates onto the Surface of MOF-808 Framework." Russ. J. Coord. Chem. 2024. 50(9). P. 646-652.
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Temperature Dependence of the Sensitivity of PVDF Pyroelectric Sensors to THz Radiation: Towards Cryogenic Applications
Published in Sensors, 2024
We characterized the performance of the PVDF sensor at helium temperatures.
Recommended citation: Sinelnikov A.N., Melnikov A.R., Getmanov Y.V., Kolomeec D.A., Kalneus E.V., Fedin M.V., Veber S.L. "Temperature Dependence of the Sensitivity of PVDF Pyroelectric Sensors to THz Radiation: Towards Cryogenic Applications." Sensors. 2024. 24. Art. Num. 5808.
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Paramagnetic Gas Adsorbed in Metal–Organic Framework: A Promising Platform for Spin Qubits Design
Published in The Journal of Physical Chemistry C, 2025
This paper is about nitric oxide (NO) in MOF-808 matrix
Recommended citation: Yazikova A.A., Tomilov A.S., Afimchenko N.A., Zilberberg I.L., Melnikov A.R., Smirnova K.A., Poryvaev A.S., Fedin M.V. "Paramagnetic Gas Adsorbed in Metal–Organic Framework: A Promising Platform for Spin Qubits Design." J. Phys. Chem. C. 2025. 129(17). P. 8455-8463.
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Inter-Kramers electric quadrupole transitions in high-spin systems induced by resonant alternating inhomogeneous electric field
Published in The Journal of Applied Physics, 2025
This theoretical paper compares E2 and M1 transitions in single-molecule magnets
Recommended citation: Maryasov A.G., Melnikov A.R., Fedin M.V., Veber S.L. "Inter-Kramers electric quadrupole transitions in high-spin systems induced by resonant alternating inhomogeneous electric field." J. Appl. Phys. 2025. 138(12). Art. Num. 123906.
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Monitoring S=0 ↔ S=2 Spin-State Switching in Fe(II) Complex Using FT EPR and Trityl Radical as Local Magnetic Field Sensor
Published in Applied Magnetic Resonance, 2025
In this paper, we proposed a contactless spin probe to monitor spin crossover transitions in EPR-silent coordination compounds
Recommended citation: Borodulina A.V., Melnikov A.R., Samsonenko A.A., Rogozhnikova O.Yu., Tormyshev V.M., Fedin M.V., Veber S.L. "Monitoring S=0 ↔ S=2 Spin-State Switching in Fe(II) Complex Using FT EPR and Trityl Radical as Local Magnetic Field Sensor" Appl. Magn. Res. 2025. 56. P. 1535–1547.
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Thermomagnetic Bistability, Colossal Negative Thermal Expansion, and THz-Heat-Induced Switching in Cu-Nitroxide Complex
Published in Angewandte Chemie International Edition, 2025
In this paper, we report the first Cu(II)-nitroxide complex that exhibits TIESST-driven bistability up to 116 K
Recommended citation: Smirnova K., Golomolzina I., Fokin S., Tolstikov S., Chernavin P., Letyagin G., Romanenko G., Zaitsev K., Melnikov A., Veber S., Fedin M., Bogomyakov A. "Thermomagnetic Bistability, Colossal Negative Thermal Expansion, and THz-Heat-Induced Switching in Cu-Nitroxide Complex" Angew. Chem. Int. Ed. 2025. Art. Num. e202514043.
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Application of pulsed heating in time-resolved EPR spectroscopy for longitudinal relaxation measurements
Published in The Journal of Chemical Physics, 2025
In this paper, we propose a new variant of transient (TR) EPR spectroscopy for measuring spin-lattice relaxation time in magnetically concentrated compounds
Recommended citation: Melnikov A.R., Maryasov A.G., Ishchenko A.S., Getmanov Y.V., Isaev N.P., Efimov N.N., Fedin M.V., Veber S.L. "Application of pulsed heating in time-resolved EPR spectroscopy for longitudinal relaxation measurements" J. Chem. Phys. 2025. 163(16). Art. Num. 164201.
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Atomize: A Modular Software for Control and Automation of Scientific and Industrial Instruments
Published in Journal of Open Research Software, 2025
In this paper, an open sources software for control and automation of scientific and industrial instruments is described
Recommended citation: Melnikov A., Vedkal A., Ishchenko A., Veber S. "Atomize: A Modular Software for Control and Automation of Scientific and Industrial Instruments" J. Open Res. Softw. 2025. 13(1). Art. Num. 26.
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talks
EPR spectroscopy endstation at the Novosibirsk free electron laser facility: Status 2025
Published:
The electron paramagnetic resonance (EPR) endstation at the Novosibirsk free electron laser facility allows performing continuous wave and time-resolved EPR experiments under pulsed irradiation of the system under study by terahertz (THz, 25-111 cm−1, 90-400 μm; 0.75-3.3 THz) radiation. Recently, several improvements of experimental equipment and software have been carried out at the endstation to realize the pulsed EPR spectroscopy, including the use of THz radiation pulses. Herein, we present the current status of the EPR spectroscopy endstation. First, an X-band pulsed EPR spectrometer is described, which was developed for spin relaxation measurements and for applications in pulsed dipolar and hyperfine spectroscopy. The Atomize modular open source software is used to control the spectrometer. The software allows the operator to observe the processed signal (after Fourier transform, phase cycling, etc.) in real time, both for setting up the experiment (selection of magnetic field, setting of pulse intervals, etc.) and for monitoring the progress of the experiment. Second, two specialized probeheads are presented, which were created to perform different types of experiments under THz radiation in Faraday geometry. The first is a microwave probehead for pulsed EPR experiments, while the second allows an inductive detection of temperature-induced magnetization dynamics. To evaluate the performance, several coordination compounds were investigated using low-energy pulses of a terahertz free electron laser of the Novosibirsk free electron laser facility. These experimental capabilities were applied to investigate THz-assisted processes in a family of field-induced Co(II)-based single-ion magnets (SIMs) with S = 3/2, whose structural and magnetic properties had been thoroughly characterized in prior studies. By varying the wavelength of THz radiation, three cases were studied in detail: (i) off-resonance irradiation, (ii) THz-pumping of mS = −3/2 ↔ mS = −1/2 transitions, and (iii) THz-pumping of mS = +3/2 ↔ mS = +1/2 transitions. Experiments (i) revealed temperature-induced magnetization dynamics caused by lattice heating under THz irradiation. Experiments (ii) and (iii) clearly demonstrated direct excitation of spin transitions by THz radiation, resulting in a non-equilibrium population of the ground state. By tuning the THz wavelength, the SIM magnetization could be polarized in both directions: toward “heating” or “cooling”. In absolute values, at a base temperature of 3.4 K, THz excitation induced a 0.4 K temperature shift in the spin system. This work was supported by the Russian Science Foundation 23-73-00042.
teaching
Introduction to Magnetic Resonance
Semester-long course of lectures and seminars, Novosibirsk State University, Department of Natural Sciences, 2021
Introduction to magnetic resonance for graduate students
Structure of Matter
Annual course of lectures and seminars, Novosibirsk State University, Department of Natural Sciences, 2022
Fundamental annual course on the structure of matter