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Spatiotemporal Localization of X-Ray Emission Regions in a Long High-Voltage Discharge 长高压放电中 X 射线发射区的时空定位
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/S0021364024601751
E. V. Parkevich, K. V. Shpakov, A. A. Rodionov, I. S. Baidin, Ya. K. Bolotov, A. V. Oginov
{"title":"Spatiotemporal Localization of X-Ray Emission Regions in a Long High-Voltage Discharge","authors":"E. V. Parkevich,&nbsp;K. V. Shpakov,&nbsp;A. A. Rodionov,&nbsp;I. S. Baidin,&nbsp;Ya. K. Bolotov,&nbsp;A. V. Oginov","doi":"10.1134/S0021364024601751","DOIUrl":"10.1134/S0021364024601751","url":null,"abstract":"<p>Synchronous spatiotemporal measurements of hard X rays emitted during the development of a high-voltage discharge at voltages of ~1 MV in half-meter open air gaps have been carried out for the first time. Using an array of scintillation detectors with lead diaphragms and the nanosecond photography of the discharge in the intrinsic luminescence, it has been shown that X rays are emitted in the discharge development stage when numerous brightly luminescent plasma channels are formed in the entire discharge gap and the discharge current with an amplitude of hundreds of amperes flows. It has been found that the emission of X rays (photons with energies above 5 keV) can start almost synchronously in the entire discharge gap, including the cathode and anode regions, near-cathode and near-anode regions, and the middle of the discharge gap. The statistical distributions of the total power and the number of the observed X-ray flashes along the discharge gap have been obtained.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 2","pages":"109 - 114"},"PeriodicalIF":1.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Logarithmic Relaxation of the Photoconductivity of a Quasi-One-Dimensional TiS3 Semiconductor 准一维 TiS3 半导体光电导性的对数弛豫
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/S0021364024602197
I. G. Gorlova, S. G. Zybtsev, V. Ya. Pokrovskii, S. A. Nikonov, S. V. Zaitsev-Zotov, A. N. Titov
{"title":"Logarithmic Relaxation of the Photoconductivity of a Quasi-One-Dimensional TiS3 Semiconductor","authors":"I. G. Gorlova,&nbsp;S. G. Zybtsev,&nbsp;V. Ya. Pokrovskii,&nbsp;S. A. Nikonov,&nbsp;S. V. Zaitsev-Zotov,&nbsp;A. N. Titov","doi":"10.1134/S0021364024602197","DOIUrl":"10.1134/S0021364024602197","url":null,"abstract":"<p>Transient processes in the photoconductivity of TiS<sub>3</sub> single crystals exposed to rectangular light pulses in the wavelength range of λ = 405–940 nm are investigated. It is established that the decay in the photoconductivity after switching the light off at temperatures from 78 to 180 K is described by a logarithmic law in the range from 10<sup>–3</sup> to 10<sup>2</sup> s (i.e., when time changes by five orders of magnitude). This means that the relaxation process is characterized by times ranging, at least, from several tens of microseconds to several tens of minutes. It is shown that the relaxation is basically successive: the recombination barrier increases while the conductivity approaches the equilibrium value.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 2","pages":"133 - 139"},"PeriodicalIF":1.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Production of Positrons by Cosmic Rays 宇宙射线产生的正电子
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/S0021364024601970
I. M. Dremin, D. O. Chernyshov
{"title":"Production of Positrons by Cosmic Rays","authors":"I. M. Dremin,&nbsp;D. O. Chernyshov","doi":"10.1134/S0021364024601970","DOIUrl":"10.1134/S0021364024601970","url":null,"abstract":"<p>It is shown that electromagnetic interactions of cosmic ray protons provide a noticeable contribution to positrons production. This is due to a combination of low energy threshold of electron–positron pair creation compared to the thresholds of pion creation in strong interactions and rapid decrease of the cosmic rays energy spectrum. Moreover, the electromagnetically produced positrons are very soft, therefore their annihilation with background electrons directly produces the observed 511 keV gamma-line.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 2","pages":"79 - 82"},"PeriodicalIF":1.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024601970.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Laser Transfer of Upconversion Nanoparticles 上转换纳米粒子的激光转移
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/S0021364024602069
V. S. Zhigarkov, V. I. Yusupov, E. V. Khaydukov
{"title":"Laser Transfer of Upconversion Nanoparticles","authors":"V. S. Zhigarkov,&nbsp;V. I. Yusupov,&nbsp;E. V. Khaydukov","doi":"10.1134/S0021364024602069","DOIUrl":"10.1134/S0021364024602069","url":null,"abstract":"<p>A method of the transfer of NaYF<sub>4</sub>:Yb<sup>3+</sup>Tm<sup>3+</sup>/NaYF<sub>4</sub> upconversion core/shell nanoparticles with an average size of 30 nm via laser-induced forward transfer is proposed. The method provides a high spatial resolution by creating a “sandwich” structure on the donor substrate: for reliable fixation, nanoparticles are located between gold layers 50 and 20 nm thick. The transfer of upconversion nanoparticles is implemented by focusing nanosecond laser radiation into a 30-μm-diameter spot and at optimal pulse energies of 8.5–25 μJ. It has been shown that, despite large temperature, <span>(Delta T &gt; 1000{kern 1pt} )</span> K, and pressure, <span>(Delta P &gt; 150{kern 1pt} )</span> MPa, fluctuations upconversion nanoparticles fully retain their photoluminescent characteristics.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 2","pages":"151 - 156"},"PeriodicalIF":1.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024602069.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Description of the Stark Broadening of Spectral Lines in Plasmas Taking into Account the Nonstationary Ion Microfield within the Theory of Markov Processes 马尔可夫过程理论中考虑到非稳态离子微场的等离子体光谱线斯塔克展宽描述
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/S0021364024602355
A. Yu. Letunov, V. S. Lisitsa, P. A. Loboda, A. A. Novikov
{"title":"Description of the Stark Broadening of Spectral Lines in Plasmas Taking into Account the Nonstationary Ion Microfield within the Theory of Markov Processes","authors":"A. Yu. Letunov,&nbsp;V. S. Lisitsa,&nbsp;P. A. Loboda,&nbsp;A. A. Novikov","doi":"10.1134/S0021364024602355","DOIUrl":"10.1134/S0021364024602355","url":null,"abstract":"<p>The influence of ion thermal motion on the Stark broadening of spectral lines in plasmas is investigated within the frequency fluctuation method (FFM). The method for the consistent calculation of the jumping frequency, which is the main FFM parameter, is suggested on the basis of the S. Chandrasekhar and J. von Neumann stochastic theory. The calculations of the neutral hydrogen spectra in plasmas are presented. These results are compared with the experimental data. The spectra of the Ar dopant in the deuterium plasma are calculated taking into account ion thermal motion. The effect of ion thermal motion on the dip in the He<sub>β</sub> spectral line of the He-like Ar ion is shown. The calculations of the He<sub>β</sub> lineshape of the He-like Ti ion are compared with experimental data.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 2","pages":"115 - 120"},"PeriodicalIF":1.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Probe Absorption Spectroscopy As a Tool to Study the Excited States in a Cooperative System of Two Organic Molecules 探针吸收光谱是研究两种有机分子合作体系中激发态的一种工具
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/S0021364024602227
E. A. Tarasevich, M. G. Gladush
{"title":"Probe Absorption Spectroscopy As a Tool to Study the Excited States in a Cooperative System of Two Organic Molecules","authors":"E. A. Tarasevich,&nbsp;M. G. Gladush","doi":"10.1134/S0021364024602227","DOIUrl":"10.1134/S0021364024602227","url":null,"abstract":"<p>The applicability of the method for measuring the probe absorption and gain spectra in a system of quantum emitters excited by a resonant driving field for studying cooperative photoluminescence is considered. The gain and attenuation of a probe signal in the system of two quantum emitters with the dipole–dipole interaction have been calculated for the conditions of observing the cooperative photoluminescence of a pair of impurity molecules described in the literature and close to them. The resulting dependences demonstrate the structure of excited collective molecular states, which can be used to reconstruct the positions of molecules in a matrix and to determine the difference in their photophysical properties. Thus, the probe absorption and gain spectra can be used to analyze the photoluminescence of quantum-entangled particles and to transform light signals.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 2","pages":"91 - 102"},"PeriodicalIF":1.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024602227.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Properties of Central Regions of the Dark Matter Halos in the Model with a Bump in the Power Spectrum of Density Perturbations 密度扰动功率谱凸起模型中暗物质晕中心区的性质
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/S0021364024601775
Yu. N. Eroshenko, V. N. Lukash, E. V. Mikheeva, S. V. Pilipenko, M. V. Tkachev
{"title":"Properties of Central Regions of the Dark Matter Halos in the Model with a Bump in the Power Spectrum of Density Perturbations","authors":"Yu. N. Eroshenko,&nbsp;V. N. Lukash,&nbsp;E. V. Mikheeva,&nbsp;S. V. Pilipenko,&nbsp;M. V. Tkachev","doi":"10.1134/S0021364024601775","DOIUrl":"10.1134/S0021364024601775","url":null,"abstract":"<p>A surprisingly large number of galaxies with masses of ~10<sup>9</sup>–10<sup>10</sup><span>({{M}_{ odot }})</span> at redshifts of <span>(z geqslant 9)</span> are discovered with the James Webb Space Telescope. A possible explanation for the increase in the mass function can be the presence of a local maximum (bump) in the power spectrum of density perturbations on the corresponding scale. In this paper, it is shown that simultaneously with the growth of the mass function, galaxies from the bump region must have a higher density (compactness) compared to cosmological models without a bump. These more compact galaxies have been partially included in larger galaxies and have been subjected to tidal gravitational disruption. They have been less destructed than “ordinary” galaxies of the same mass, and some of them could survive to <i>z</i> = 0 and persist on the periphery of some galaxies. The formation and evolution of compact halos in a cube with a volume of (47 Mpc)<sup>3</sup> with (1024)<sup>3</sup> dark matter particles in the redshift range from 120 to 0 have been numerically simulated and observational implications of the presence of such galaxies in the current Universe have been discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 2","pages":"83 - 90"},"PeriodicalIF":1.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024601775.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interrelation between Doping Dependencies of the Spin Susceptibility and Electronic Structure in Cuprates 铜氧化物中自旋感度的掺杂依赖性与电子结构之间的相互关系
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/S0021364024601945
V. I. Kuz’min, M. M. Korshunov, S. V. Nikolaev, T. M. Ovchinnikova, S. G. Ovchinnikov
{"title":"Interrelation between Doping Dependencies of the Spin Susceptibility and Electronic Structure in Cuprates","authors":"V. I. Kuz’min,&nbsp;M. M. Korshunov,&nbsp;S. V. Nikolaev,&nbsp;T. M. Ovchinnikova,&nbsp;S. G. Ovchinnikov","doi":"10.1134/S0021364024601945","DOIUrl":"10.1134/S0021364024601945","url":null,"abstract":"<p>We calculate electronic structure and spin susceptibility dependencies on doping within the framework of a cluster perturbation theory for strongly correlated electronic systems. The change in the susceptibility with increasing doping is qualitatively consistent with the experimental data on resonant inelastic X-ray scattering and inelastic neutron scattering, as well as with the results of the calculations within the quantum Monte Carlo method.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 1","pages":"46 - 49"},"PeriodicalIF":1.4,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024601945.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photoelectric Nature of Nanocomposite ZnO/CuO Antibacterial Activity 纳米复合氧化锌/氧化铜抗菌活性的光电性质
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/S0021364024601805
I. N. Saraeva, D. A. Zayarny, A. A. Nastulyavichus, E. R. Tolordava, E. V. Ulturgasheva, P. V. Krikunova, S. I. Kudryashov
{"title":"Photoelectric Nature of Nanocomposite ZnO/CuO Antibacterial Activity","authors":"I. N. Saraeva,&nbsp;D. A. Zayarny,&nbsp;A. A. Nastulyavichus,&nbsp;E. R. Tolordava,&nbsp;E. V. Ulturgasheva,&nbsp;P. V. Krikunova,&nbsp;S. I. Kudryashov","doi":"10.1134/S0021364024601805","DOIUrl":"10.1134/S0021364024601805","url":null,"abstract":"<p>We present the study of the antibacterial properties of ZnO/CuO films, activated by LED lamp light with an emission spectrum close to that of natural sunlight, on an example of antibiotic-resistant <i>S. aureus</i> bacterial culture. The antibacterial properties of films with photoinduced electroporation lead to the emergence of a potential difference between semiconductor <i>n</i>-type ZnO and <i>p</i>-type CuO nanoparticles with a local increase in field intensity to a value <span>( sim {kern 1pt} 1 times {{10}^{4}})</span> V/cm, sufficient for irreversible electroporation to occur. Exposure leads to a decrease in bacterial contamination from the value <span>(8 times {{10}^{8}})</span> CFU/mL to 0. Raman spectra before and after exposure were analyzed by calculating spectral peak parameters corresponding to molecular vibrations in nucleic acids, cell membranes, and proteins. The disappearance or degradation of peaks illustrating vibrations of A, G in nucleic acids, disruption of the secondary structure of proteins and the appearance of disordered forms of amide I were detected, as well as the emerging disorder of lipid chains in the membrane and the destruction of N-acetylmuramic acid and N-acetylglucosamine, which are part of the gram-positive microorganisms’ cell membrane, therefore indicating the destruction of the cell wall and irreversible destruction of the internal structure of the cells.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 1","pages":"70 - 78"},"PeriodicalIF":1.4,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024601805.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
“Branching Asymmetry” of the Coherent Population Trapping Resonance 相干群体陷波共振的 "分支不对称"
IF 1.4 4区 物理与天体物理
JETP Letters Pub Date : 2024-08-24 DOI: 10.1134/S0021364024601842
E. A. Tsygankov, D. S. Chuchelov, M. I. Vaskovskaya, S. A. Zibrov, V. V. Vassiliev, V. L. Velichansky
{"title":"“Branching Asymmetry” of the Coherent Population Trapping Resonance","authors":"E. A. Tsygankov,&nbsp;D. S. Chuchelov,&nbsp;M. I. Vaskovskaya,&nbsp;S. A. Zibrov,&nbsp;V. V. Vassiliev,&nbsp;V. L. Velichansky","doi":"10.1134/S0021364024601842","DOIUrl":"10.1134/S0021364024601842","url":null,"abstract":"<p>The appearance of the population difference in the ground state of the <span>(Lambda )</span>-system due to the spontaneous decay of the upper level into lower ones is considered. The resulting asymmetry of the coherent population trapping resonance is shown to lead to a frequency shift of the quadrature signal, which nonlinearly depends on the optical field intensity. In this case, this contribution is not suppressed due to the use of high modulation frequencies compared to the relaxation rate of ground state polarization (analogue of the Pound–Drever–Hall technique). A significant smallness of this shift when using a binary mixture of noble buffer gases is discussed.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"120 1","pages":"33 - 37"},"PeriodicalIF":1.4,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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