Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ
“Известия Российской академии наук. Серия физическая” (Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, ISSN 0367-6765; English translation: “Bulletin of the Russian Academy of Sciences: Physics”, ISSN 1062-8738) is a Russian peer-reviewed scientific journal established in 1936 as the Bulletin of the Academy of Sciences of USSR: Physics Series. It presents full-text articles with the most recent results in miscellaneous fields of physics and astronomy: nuclear physics, cosmic rays, condensed matter physics, plasma physics, optics and photonics, nanotechnologies, solar and astrophysics, physical applications in material sciences, life sciences, etc. The journal focuses on the most relevant multidisciplinary topics in natural sciences, both fundamental and applied.
For more than 80 years, the main purpose of the journal is to provide authors with the opportunity to publish and discuss the results of relevant fundamental and applied scientific research, presented at conferences, symposiums and scientific schools, organized by the Russian Academy of Sciences, which are recognized by the world scientific community and interdisciplinary experts. The journal accepts for publishing full-text articles, which are prepared on the base of best talks, recommended by program committees of the scientific events, which are of interest to a wide range of readers. Articles containing new and previously unpublished results are peer-reviewed by at least two independent reviewers and are published in special thematic issues of the journal. The journal is open for publishing of the most authoritative and advanced research results in the field of fundamental and applied physics, obtained in Russia and neighboring countries, as well as from authors from all over the world.
The journal is published by the Russian Academy of Sciences under the conduction of the Physical Sciences Division of RAS. The originator is the Editorial Board of the journal “Bulletin of the Russian Academy of Sciences: Physics”.
Until 2018, the journal was published by “Nauka” Publishing House.
Preparation of the original layout and publication of the journal is currently carried out under the state contract by LLC “Thematic Editorial”.
Certificate of registration of mass media ПИ No. ФС 77 – 82377 dated December 10, 2021, issued by the Ministry of press and information of the Russian Federation.
The journal is included in the List of journals recognized by the Higher Attestation Commission of the Ministry of Science and Higher Education of the Russian Federation and included into the Russian scientific citation system RSCI. The translated version of the journal – Bulletin of the Russian Academy of Sciences: Physics – is indexed in Scopus and is included in the Russian Science Citation Index database on the Web of Science platform.
English version of the journal – Bulletin of the Russian Academy of Sciences. Physics is published by Allerton Press Inc. (Pleiades Publishing) and distributed by Springer Nature Switzerland AG.
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Volume 89, Nº 3 (2025)
Electronic, Spin and Quantum Processes in Molecular and Crystalline Systems
Current state of the spin chemistry theory: paradigm of spin chemistry
Resumo
We briefly discussed the problems of the theory of spin chemistry. Promising examples of the application of spin chemistry results are given. In chemical kinetics, it is necessary to consider the possibility of changing the electron multiplicity of reagents during elementary chemical acts.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):338–349
338–349
Non-covalent structures of negative ions in dissociative electron capture spectra
Resumo
Over the last ten years, a few examples of so-called non-covalent structures of negative ions have been found, the geometry of which differs significantly from the geometry of the original molecules. In particular, the lengths of carbon-halogen bonds reach 2.7–3 Å, and the halogen atom itself can circle the hydrocarbon skeleton of the anion, the so-called roaming effect. Such non-covalent structures can have a significantly higher electron affinity than the original molecules.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):350–355
350–355
Photoinduced electron transfer in deferiprone chelate complexes with nontransition metal ions
Resumo
The formation and photo degradation of deferiprone chelate complexes with calcium and zinc ions have been studied by CIDNP and LFP methods. It was established that deferiprone in complexes undergoes rapid decomposition under the UV irradiation. Radical intermediates of deferiprone have been registered, and it was shown that the quantum yield of deferiprone photo degradation in the complex with zinc increases by 6.4 times.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):356–363
356–363
Evolution of gas-phase hyperthermal fragmental negative ions of 1H-1,2,4-triazole in their interaction with a graphite-like conducting surface
Resumo
It has been established that during the interaction of hyperthermal fragmentary negative ions of 1H-1,2,4- triazole: C2H2N3– and C2N3– with the cleaned soot surface, the intensity of the effective yield curve of the C2H2N3– anion decreases, but the C2N3– anion does not. Based on density functional theory calculations and the use of a surface-induced charge model, a mechanism for neutralizing negative ions on the surface is proposed.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):364–368
364–368
Radiation cooling of long-lived molecular negative ions of phenazine
Resumo
Based on the harmonic cascade model, the rate constants of radiative cooling of the molecular negative ions of phenazine were calculated. It was determined that radiative cooling of molecular negative ions does not significantly affect the rates of electron autodetachment and makes no distortion to the results of measuring the negative ions lifetime by resonance electron capture mass spectrometry.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):369–373
369–373
Transport and magnetic properties BaxSr2-xFeCoO6
Resumo
Measurements of the magnetic resonance spectra of BaxSr2-xFeCoO6 ceramics (x = 0, 0.1, 0.3, 0.5) were carried out in a wide temperature range from 300 to 700 K. At temperatures above 466, 519 and 472 K, phase transitions were observed for samples BaxSr2-xFeCoO6 x = 0.1, 0.3 and 0.5, respectively. The activation energy of the small polaron responsible for the jump conductivity was determined.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):374–379
374–379
Micromagnetic modeling of skyrmions in ferro- and ferrimagnetic structures
Resumo
The mechanisms and conditions of existence of skyrmions in ferro- and ferrimagnetic systems are determined because of micromagnetic modeling. The features of current-induced skyrmion motion are also estimated depending on the magnitude of the Dzyaloshinskii-Moriya interaction, saturation magnetization, magnetic anisotropy and the attenuation parameter. The prospects of ferrimagnetic systems in comparison with ferromagnetic ones for investigation of skyrmions are shown.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):380–385
380–385
Micromagnetic states and Bloch points in multilayer nanofilms: influence of anisotropy and magnetic field
Resumo
We presented a numerical simulation of the processes of magnetization reversal of an exchange-coupled magnetic nanostructure, studies micromagnetic states in the system and their transformation under the influence of an external magnetic field and shows the possibility of realizing magnetic states of the Bloch point type. The influence of magnetic anisotropy constants of the “easy plane” type on the conditions of existence and structure of topological objects is studied.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):386–391
386–391
Formation and properties of molybdenum oxide injecting contacts for organic electronics devices
Resumo
Using the X-ray and ultraviolet photoelectron spectroscopy, X-ray diffraction and atomic force microscopy the atomic composition, work function, and structural properties of thin (10–150 nm) MoO3 films obtained by magnetron sputtering were carried out.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):392–396
392–396
Influence formation conditions of polydiphenylenephthalide films on thermostimulated depolarization currents
Resumo
The effect of a constant magnetic field (СMF) on the formation of a polymer film was studied for the first time. It was found that polydiphenylene phthalide films manufactured in СMP demonstrate increased electrical conductivity. The electrophysical parameters of the film were evaluated within the framework of the injection model. By the method of thermally stimulated depolarization, it was found that СMP promotes the ordering of macromolecules in the film.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):397–401
397–401
Study of quasi-one-dimensional conductive structures in polymer layers
Resumo
We presented the results of an experimental study of local switching in submicron polymer films, the consequence of which is the appearance of quasi-one-dimensional conductive structures of nanoscopic dimensions. The switching area was visualized using atomic force microscopy with a conductive probe.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):402–407
402–407
Electronic gas sensors based on polymer and nanocomposite materials
Resumo
We study nanocomposite thin films based on a polyelectrolyte complex of chitosan and chitosan succinimide with a filler in the form of single-walled carbon nanotubes and thin films of polyaniline derivatives. The effect of thin film morphology on electrical conductivity, sensory sensitivity to air humidity of thin-film structures based on them, and reaction to ammonia vapors were studied.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):408–413
408–413
Electrical resistance of some types of homooligonucleotides
Resumo
We presented the results of a study of the electrical resistance of two types of short single-stranded DNA molecules consisting of only one type of nucleotides — dA or dC, using scanning tunneling microscopy and spectroscopy. It was found that the resistance of dC12 homooligonucleotides is slightly higher than that of dA12 homooligonucleotides.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):414–418
414–418
Application of printing technologies for forming functional copoly(arylene ether ketone) films for flexible electronics
Resumo
The conditions for the formation of copoly(arylene ether ketones) films by layer-by-layer deposition were studied. The possibility of obtaining films with a minimum thickness of up to 1 µm, by the layer-bylayer deposition method, possessing electroactivity and sensitivity to changes in environmental conditions: humidity and temperature, was established. The results obtained can be used to develop additive printing technology for flexible electronics.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):419–424
419–424
Investigation of the corrosion resistance of Ti40.0Ni51.0 alloy in various structural states
Resumo
The study of the corrosion resistance of Ti49.0Ni51.0 alloy in the initial coarse-grained state and in the state after preliminary aging was carried out. 0.9% NaCl, Ringer’s solution, and Hanks’ solution were chosen as corrosive media that mimic the biological environment of the body. We obtained that corrosion occurs in all states studied with the formation of pitting and the release of corrosion products on the surface.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):425–430
425–430
Effect of the structural state on the corrosion resistance of pure magnesium
Resumo
We study the effect of the structural state after deformation on the corrosion resistance of pure magnesium. It was found that precipitation by ~ 10% at a temperature of 150 °C, annealed after equal-channel angular compression, allows to obtain the best corrosion resistance (11.2 ± 0.6 mm/year) by increasing the density of the twins to 779 • 10-5 pm-2.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):431–436
431–436
Features of corrosive-mechanical strength of TiNi alloy in different structural states in biological solutions
Resumo
We performed the study of the corrosion-mechanical strength and fractographic analysis of fractures of the Ti49.1Ni50.9 alloy in coarse-grained and ultrafine-grained states in biological environments. The study has shown that there is a multidirectional change in the mechanical characteristics of the Ti49.1Ni50.9 alloy in coarse-grained and ultrafine-grained states.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):437–441
437–441
442–446
Electric-field-induced dynamics of topological loops in chiral nematic liquid crystal droplets
Resumo
We presented an experimental study of structural transitions in chiral nematic liquid crystal droplets under the action of alternating electric field. We identify that the increase of the applied voltage results in a periodic transition between bipolar and radial structures.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):447–452
447–452
Photophysical characteristics of solutions of divalent europium dihalides EuX2 (X = Cl, Br). Aluminum alkyls as enhancers of luminescence of the Eu2+ ion
Resumo
The photophysical properties of solutions of EuCl2 and EuBr2dihalides in tetrahydrofuran have been studied in detail for the first time. Absorption, photoluminescence (4f65d1 → 4f7 transition) and photoluminescence excitation spectra as well as photoluminescence yields and lifetime of excited Eu2+* ions were measured. The effect of increasing the luminescence intensity of the Eu2+ ion in the presence of aluminium alkyls was discovered to be due to the rigid structure of the four-centre complex formed by the interaction of EuCl2 and EuBr2 with aluminium alkyls.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):453–457
453–457
Low temperature luminescence of poly(diphenylene phthalide)
Resumo
UV-Irradiation of poly(diphenilenephthalide) leads to generation of separated ion-radical states and their stabilization by polymeric matrix. A technique for recording low-temperature luminescence (T = 80–150 K) of poly(arylene phthalides) as a consequence of ion-radical states recombination has been described. The decay kinetics of low-temperature luminescence intensity of poly(diphenilenephthalide) have been found to be polychronous.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):458–462
458–462
Electron-stimulated luminescence of polycyclic aromatic hydrocarbons under ultrasonic influence on terbium sulfate suspensions in solutions of these hydrocarbons in decane
Resumo
In the sonotriboluminescence spectra (luminescence arising in suspensions during sonication with intense collisions and destruction of crystals) of lanthanide salts in decane containing polycyclic aromatic hydrocarbons, emission bands of molecules of these hydrocarbons were recorded. Luminescence of aromatic hydrocarbons in suspensions is caused by their excitation by electrons.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):463–467
463–467
Modeling of the influence of the aquatic environment on the energies of boundary orbitals of a subnanosized titanium dioxide cluster
Resumo
Within the framework of the “quantum theory of atoms in a molecule”, the ionic nature of the bonding of a subnanosized cluster (TiO2)10 with water molecules and the predominant contribution to the binding energy of contacts of the Ti...O type have been established. The influence of water on the energies of boundary orbitals and the energy gap (TiO2)10 within the framework of the model of a polarizable continuum and a discrete hydrate shell, as well as temperature accounting using ab initio dynamics, is shown.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):468–473
468–473
Structure of hydrogen complexes in hydrates of the 1,2-naphthoquinone molecule
Resumo
The question of the quantitative composition and structure of the formed hydrogen complexes of the 1,2-naphthoquinone molecule with water molecules in its hydration shell is considered. The problem was solved by comparing the calculated shifts of electronic transitions during the formation of hydrogen complexes with n = 5–13 water molecules with the experimental shifts of the absorption bands of 1,2-naphthoquinone in a water solution compared to a solution in n-hexane.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):474–481
474–481
Sagnac effect in the spacetime of tidal black holes
Resumo
We study the Sagnac effect in the space-time of a spinning black hole with a tidal charge ?. It is shown that the greatest influence of the tidal (electric) charge is occured at close distances to the black hole. An increase in the tidal charge leads to an increase in the Sagnac delay. Numerical estimates have shown that for the Earth, the Sagnac delay is determined in the range from –63.8 to –1.5 ns.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):482–487
482–487
Articles
Simulation of photon transport in a fractal waveguide considered for 3–5 order nonlinearity
Resumo
We study the features of quantum transport of photons in a waveguide lattice with a fractal structure of two types — a triangle and a Sierpinski square, formed by hexagons. Based on the discrete Schrodinger equation, considering 3–5 order nonlinearity, the evolution of the system is analyzed. The influence of fractal geometry on quantum transport of photons in a waveguide lattice is revealed.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):488–492
488–492
New types of fractal images for use in art therapy and ophthalmology
Resumo
New physical approaches to expanding the range of fractal images presented to patients in art therapy and ophthalmology have been developed and justified. They are based on the use of speckle-like light structures with multifractal geometry and the geometry of polynomial attractors.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):493–497
493–497
Analysis of the effect of a recurrent neural network size on modeling and prediction accuracy of a stochastic FitzHugh–Nagumo neuron
Resumo
We study the performance of a reservoir computing-based network in dynamics forecast of a FitzHugh–Nagumo model driven by white noise versus reservoir size. We show that the accuracy of signal prediction of a model neuron strongly depends on the number of neurons in the reservoir. The most accurate prediction of both the dynamics itself and the simulation of the coherence resonance phenomenon is achieved when using 500 neurons.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(3):498–502
498–502