Himičeskaâ fizika
ISSN(Print): 0207-401X
Media registration certificate: No. 0110275 dated 02/09/1993
Founder: Russian Academy of Sciences, Federal Research Center for Chemical Physics named after. N.N. Semenov RAS
Editor-in-Chief: Buchachenko Anatoly Leonidovich
Number of issues per year: 12
Indexation: RISC, list of Higher Attestation Commissions, CrossRef, White List (level 2)
The journal publishes articles on the following topics:
- elementary physical and chemical processes
- structure of chemical compounds, spectroscopy, quantum chemistry
- reactivity, influence of external fields and environment on chemical transformation
- molecular dynamics and molecular organization
- dynamics and kinetics of photo- and radiation-induced processes
- mechanism of chemical reactions in the gas and condensed phases and at interphase boundaries
- chain and thermal processes of ignition, combustion and detonation in gases, in two-phase and condensed systems
- shock waves
- physical methods for the study of chemical reactions
- biological processes in chemical physics
The journal is designed for researchers, graduate students and students specializing in the study of the kinetics and mechanism of chemical reactions, energy transfer processes, the structure of matter, catalysis, combustion and detonation processes, transformations in shock waves
The journal is designed for researchers, graduate students and students specializing in the study of the kinetics and mechanism of chemical reactions, energy transfer processes, the structure of matter, catalysis, combustion and detonation processes, transformations in shock waves.
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Vol 44, No 10 (2025)
Kinetics and mechanism of chemical reactions, catalysis
Effect of demineralization on brown coal pyrolysis under laser pulses influence
Abstract
The formation of pyrolysis gaseous products from initial and demineralized tableted brown coal microparticles under the influence of microsecond laser pulses (1064 nm, 120 μs, 6 Hz, 0.3–1.9 J/cm²) was studied. When the threshold values of the energy density of laser pulses are exceeded, the formation of gases H2, CH4, CO and CO2 begins. Their concentration increases linearly with the growth of the energy density H. The rate of formation of H2 is 3.5 times higher for demineralized samples than for the initial ones.
Himičeskaâ fizika. 2025;44(10):3-15
3-15
Combustion, explosion and shock waves
Equation of State for Calculating RDX Temperature
Abstract
In the work on the example of hexogen, an approach to determining the constants in the equation of state of molecular crystals was tested, which allows calculating the isothermal compression pressure. When implementing this approach, an algorithm was proposed to recalculate experimental or calculated data on isothermal compression to the shock adiabat of hexogen, which makes it possible to obtain pressure values at the shock wave front that are in good agreement with known experimental data. When calculating the temperatures of shock-wave compression, an analysis of various models of the dependence of heat capacity at a constant volume on temperature was carried out, which made it possible to significantly simplify the equations of state.
Himičeskaâ fizika. 2025;44(10):16-23
16-23
Registration methods of radiation characteristics of shock-heated gases
Abstract
The analysis of the main methods for recording the radiation characteristics of high-temperature gases behind the front of a strong shock wave, including the 3D-spectroscopy method and the time-integrated spectroscopy method, is carried out. A more realistic approach to processing experimental data is proposed, which presents the obtained information in the form of spectrograms of the thermal flux power of shock-heated gas. Spectrograms of the thermal flux power of shock-heated air measured by the time-integrated spectroscopy method in the shock wave velocity range from 8 to 11 km/s at an initial pressure of 0.25 Torr are analyzed. Their comparison with the corresponding spectrograms obtained by the 3D-spectroscopy method showed that both methods give approximately the same results.
Himičeskaâ fizika. 2025;44(10):24-33
24-33
Combustion characteristics of fuel compositions based on oil and coal sludge
Abstract
Fuel mixtures based on coal and oil sludge were studied. Waste cooking oil and distilled tall oil with a mass fraction of 5% in the mixture were used as additional components. In the experiments, the main energy and emission characteristics of the mixture combustion were determined for the subsequent calculation of the integral efficiency indicator using multi-criteria decision analysis. It was shown that the addition of tall oil provides higher (by 5–17%) fuel efficiency indicators compared to the addition of waste cooking oil. For coal sludge-based fuels, the additives had a positive effect on sedimentation stability, calorific value and combustion efficiency, ignition delay times, reducing the latter by 10–20%. In the case of oil sludge-based fuels, the oil additives had a moderate effect on the recorded characteristics.
Himičeskaâ fizika. 2025;44(10):34-45
34-45
Detonation characteristics of finely dispersed ammonium perchlorate
Abstract
Using a quasi-one-dimensional model of steady detonation with a divergent flow in the reaction zone, an analysis of an array of experimental data on the detonation rate of finely dispersed ammonium perchlorate was carried out, which was obtained at one time by Donna Price with her colleagues from the NOL Laboratory of the USA. In these experiments, the diameter and initial charge density varied over a wide range. As a result of the analysis, the values of two coefficients included in the equation of the rate of exothermic conversion of AP (the pressure exponent n and the rate constant G) were determined, at which the calculations are consistent with the experiment on the dependence of the detonation velocity on the charge diameter for five different values of initial density. In all calculations, the exponent of n turned out to be 1.0, and the constant G decreased by more than 4 times, as the initial density increased from 1.0 to 1.45 g/cm3. The flow characteristics in the detonation wave reaction zone were calculated. The detonation wave front has a shape close to spherically symmetrical, only on and near the charge axis. The radius of curvature of the front, which is close in magnitude to the diameter of the charge on the charge axis, decreases 4–5 times as it approaches the side interface of the charge. Along with the radius of curvature near the side interface, the pressure at the wave front decreases significantly. The width of the reaction zone, from the wave front to the Chapman-Jouget point, is about 3 mm and increases with increasing density. An analysis of the calculated characteristics of the reaction zone for near-critical conditions close to detonation failure showed that a significant decrease in the particle velocity gradient at the wave front due to energy losses in the lateral rarefaction wave is observed at the side interface of the charge and is absent on the charge axis. Thus, it is the side interface of the charge that should be considered as the place whereconditions for detonation failure are formed, as a result of a decrease in the rate of exothermic conversion and an increase in energy losses in the lateral rarefaction wave.
Himičeskaâ fizika. 2025;44(10):46-58
46-58
Динамика фазовых переходов
Modified Ornstein-Zernike Critical State Theory
Abstract
In this work, a generalization of the Ornstein–Zernike theory of the critical state is proposed. The new approach makes it possible to reconstruct the pair correlation radius – the key parameter of the pair correlation function in the critical state – based on experimental Rayleigh scattering data from a critically opalescent fluid. As an application of the theory, experimental small-angle scattering data for critically opalescent carbon dioxide were used. It is shown that in the near-critical region, an increase in fluid temperature leads to a limited growth of the pair correlation radius.
Himičeskaâ fizika. 2025;44(10):59-69
59-69
Химическая физика атмосферных явлений
Ion accumulation by spherical clouds of microparticles in the ionized atmosphere
Abstract
The parameters of low-pressure electric discharge plasma in neon with microparticles have been calculated, at which spherical clouds of charged microparticles have been experimentally obtained. The indices determining the efficiency of ion accumulation by spherical clouds are formulated and the character of change of these indices for microparticles of different sizes depending on gas and microparticle concentrations is determined. The parameters of spherical cloud formation in terms of pressure and temperature of the experimental medium were compared with the parameters of the standard atmosphere at different altitudes.
Himičeskaâ fizika. 2025;44(10):70-80
70-80
The formation of aerosol haze in the atmosphere
Abstract
Atmospheric aerosol containing sulfates affects air quality on a regional scale and the climate on a global scale. For example, in the northern part of the North China Plain, an agglomeration with a population of about half a billion people is systematically exposed to catastrophically rapid pollution by dense haze. In this work, for the first time, evidence is interpreted in favor of the existence of critical atmospheric conditions that enable the extremely rapid formation of sulfates and nitrates in aerosol particles and, in combination with suitable meteorological conditions (temperature, relative humidity, atmospheric stagnation, etc.), lead to the occurrence of aerosol haze. It is shown that sustained and rapid sulfate accumulation in the degenerate-branched regime of a catalytic process involving transition metal ions is possible – at a given air humidity and in an atmosphere polluted with sulfur and nitrogen oxides – only if the ammonia concentration exceeds a certain threshold. At the same time, the rate of nitrate formation also increases, driven by the coupling of sulfate and nitrate formation processes. As a result, the absorption of moisture and ammonia from the air intensifies, ensuring a self-sustaining and rapid increase in the mass concentration of aerosol haze particles in the atmosphere.
Himičeskaâ fizika. 2025;44(10):81-92
81-92
Solid products of n2o5 uptake on a methane flame soot
Abstract
Modern global models used for long-term prediction of the chemical composition of the Earth’s atmosphere require detailed information on the rate constants of numerous elementary chemical reactions. In addition, data on the composition of the reaction products is also of great importance. In this work, high-resolution mass spectrometry was used to identify the solid products of soot nitration by dinitrogen pentoxide (N2O5) during methane combustion. A high reactivity of N2O5 toward polycyclic aromatic hydrocarbons (CnHm class) present in the initial soot was established. It was shown that the solid nitration products include nitro derivatives of polycyclic aromatic compounds, aromatic acids, and their esters. In terms of composition and compound classes, the products of soot nitration by N2O5 are similar to those obtained in nitration by nitrogen dioxide (NO2).
Himičeskaâ fizika. 2025;44(10):93-102
93-102