物理学报2016，Vol.65Issue(14)：143401-1-143401-7,7.DOI:10.7498/aps.65.143401
Xe53+离子与Xe原子碰撞过程中的辐射电子俘获和辐射退激发光谱的理论研究∗
Theoretical studies on the radiative electron capture and subsequent radiative decay in the collision of Xe53+ ions with neutral Xe
摘要
Abstract
The radiative electron capture (REC) and subsequent radiative decay of initial hydrogen-like Xe52+ions are studied in the collision of Xe53+with Xe atom at a projectile energy of 197 MeV/u within the framework of the multiconfiguration Dirac-Fock method and the density matrix theory. We calculate the differential and total cross sections as well as the REC photon energies for REC to the 1snp1/2,3/2 Jf =1 (n=2–5) levels of finally helium-like Xe53+ ions. Moreover, the transition energies and rates of the subsequent 1snp3/2 Jf =1→1s2 Jd =0 decay as well as the angular distribution and linear polarization of the associated characteristic photons are also calculated. It is found that the REC photons are remarkably anisotropic. Through the analysis of the REC angular distribution characteristics, we find that the different configurations of the REC angular distribution are similar in quality, and they all have a peak at the 90◦. That is to say, the REC process can more easily occur in the direction perpendicular to the incident direction of the projectile ions. In addition, while the characteristic photons from the subsequent 1snp3/2 Jf = 1 → 1s2 Jd = 0 radiative decay of Xe52+ ions exhibit an anisotropic angular distribution and strong linear polarization, their counterparts from the 1snp1/2 Jf =1→1s2 Jd =0 decay are almost isotropic and linearly unpolarized. The angular distribution and linear polarization of the radiation photon decay from the (1snp1/2,3/2 Jf = 1) states to the ground state (1s2 Jd = 0) both reach a maximum value at the 90◦, their characteristics are similar to those of the REC photons, that is to say, the deexcited process can more easily occur in the direction perpendicular to the incident direction of the projectile ions, and in this direction the decay photons have much larger polarization degree.关键词
辐射电子俘获/极化特性/光子角分布Key words
radiative electron capture/polarization properties/angular distribution of the photon引用本文复制引用
梁腾,马堃,武中文,张登红,董晨钟,师应龙..Xe53+离子与Xe原子碰撞过程中的辐射电子俘获和辐射退激发光谱的理论研究∗[J].物理学报,2016,65(14):143401-1-143401-7,7.基金项目
国家自然科学基金(批准号:11274254, U1332206,11464042,11464040)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.11274254, U1332206,11464042,11464040) （批准号:11274254, U1332206,11464042,11464040）
