排序方式: 共有7条查询结果,搜索用时 515 毫秒
1
1.
L. A. Bureeva M. B. Kadomtsev M. G. Levashova V. S. Lisitsa A. Calisti B. Talin F. Rosmej 《JETP Letters》2010,90(10):647-650
A new expression for the Stark profiles of spectral lines in plasma has been obtained by the method of the kinetic equation
taking into account the dynamics of the plasma microfield. The result represents a dynamic line profile in the form of simple
functionals of a static profile. The relation of the new solution with the known fluctuating-frequency method has been analyzed.
It has been shown that this method is a discrete analog of the method of the kinetic equation and passes to the latter method
in the limit of the continuous fluctuations. Simple formulas (4), (5), and (21) for dynamic line profiles provide ultrafast
calculations of the profiles of spectral lines taking into account the dynamics of the plasma microfield. 相似文献
2.
V. A. Astapenko L. A. Bureeva V. S. Lisitsa 《Journal of Experimental and Theoretical Physics》2002,94(1):12-21
A universal theory and calculation results for the bremsstrahlung of electrons on complex atoms are presented. The theory accounts for the dynamic polarization of the core in the energy range from 0.5 to 10 keV, which is characteristic of radiation energy losses in a hot plasma with heavy ions. The treatment is based on the statistical atom model and the quasi-classical approximation of the incident electron. The model accounts for the penetration of the incident electron into the atomic core, which affects the relationship between the polarization and static radiation channels. The contribution of the polarization channel in both the spectral and the total radiation loss of electrons at various frequencies, nucleus charges, and energies of the incident particle is analyzed. It is shown that the contribution of the polarization channel is comparable with that of the static channel (which was calculated elsewhere) in a wide range of parameters. The results obtained are in a reasonable quantitative agreement with the detailed quantum-mechanical calculation carried out for individual atoms. 相似文献
3.
4.
Universal relations have been derived to describe the spectral-angular dependence of the polarization bremsstrahlung of a fast charged particle, based on a statistical model for the electron skeleton of the target. Three statistical atomic models are considered in terms of which the target characteristics that determine the cross section for polarization bremsstrahlung are calculated and analyzed. 相似文献
5.
The results of investigations of main characteristics of a one-dimensional percolation theory (percolation threshold, critical
exponents of correlation radius and specific heat, and free energy) are presented for the bond and site problems. For the
first time it is shown that for a finite-size system the stability condition is fulfilled while the scaling hypothesis is
inacceptable for one-dimensional bond problem. 相似文献
6.
7.
V. A. Astapenko L. A. Bureeva V. S. Lisitsa 《Journal of Experimental and Theoretical Physics》2000,90(3):434-446
Classical and quantum theories of polarization bremsstrahlung in a statistical (Thomas-Fermi) potential of complex atoms and ions are developed. The basic assumptions of the theories correspond to the approximations employed earlier in classical and quantum calculations of ordinary bremsstrahlung in a static potential. This makes it possible to study on a unified basis the contribution of both channels in the radiation taking account of their interference. The classical model makes it possible to obtain simple universal formulas for the spectral characteristics of the radiation. The theory is applied to electrons with moderate energies, which are characteristic for plasma applications, specifically, radiation from electrons on the argon-like ion KII at frequencies close to its ionization potential. The computational results show the importance of taking account of the polarization channel of the radiation for plasma with heavy ions. 相似文献
1