激光与光电子学进展, 2018, 55 (9): 090201, 网络出版: 2018-09-08
长程库仑势在原子阈上电离能谱中的影响 下载: 700次
Effects of Long-Range Coulomb Potential in Above-Threshold Ionization Energy Spectra of Atoms
强场激光物理 阈上电离 强场近似方法 长程势 短程势 光电子能谱 strong field laser physics above-threshold ionization strong field approximation long-range potential short-range potential photoelectron energy spectra
摘要
利用改进的强场近似方法分析了长程势以及短程势在阈上电离能谱中的贡献, 确定了能谱中低能结构的起因。同时, 为了确定在计算电子与分子离子散射截面时用纯分子代替分子离子是否合理, 计算了不同入射电子能量条件下, 电子和原子离子弹性散射的微分散射截面。理论计算和实验结果表明在入射电子能量较大时, 长程势在激光诱导的电子离子大角度背向散射时的影响可以忽略, 证明了在大角度散射时, 用纯分子来代替分子离子是合理的。
Abstract
Using the improved strong field approximation method, the effects of long-range potential and short-range potential in above-threshold ionization energy spectra are investigated and the origin of the low-energy structure is also found. Meanwhile, in order to prove whether it is reasonable to use pure molecules instead of molecular ions in calculating the differential cross sections (DCS) of electrons and molecular ions, the DCS of electrons and atomic ions are calculated in some different incident electron energies conditions. The results of theoretical calculation and experiments show that the effect of long-range potential can be neglected and using pure molecules instead of molecular ions is reasonable with large-angle scattering in the large incident electron energies condition.
郭志坚. 长程库仑势在原子阈上电离能谱中的影响[J]. 激光与光电子学进展, 2018, 55(9): 090201. Guo Zhijian. Effects of Long-Range Coulomb Potential in Above-Threshold Ionization Energy Spectra of Atoms[J]. Laser & Optoelectronics Progress, 2018, 55(9): 090201.