天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室, 天津 300072
采用半经典回碰模型(semiclassical rescattering model, SRM)和含时薛定谔方程(time-dependent Schr?dinger equation, TDSE),对线偏振激光场中氢原子的蜘蛛型光电子动量谱进行了数值模拟,重点研究了散射振幅相位的提取。基于前人的研究成果,依据SRM理论和鞍点理论,得到时间参数近似相等的结论,并提出了一种相位提取的新方法。构建了两个一级近似公式,解析表达了散射振幅相位。由所提方法获得的相位与纵向动量和横向动量有关。新方法尽管增加了计算量,但是相位提取精度有显著提高。
原子与分子物理学 原子光电离 氢原子 强场光电子全息 数值模拟 光学学报
2021, 41(10): 1002001
Author Affiliations
Abstract
College of Precision Instrument and Optoelectronics Engineering, Tianjin University; Key Laboratory of Optoelectronic Information Technology, Ministry of Education, Tianjin 300072, China
The spiderlike structures in the photoelectron momentum distributions of ionized electrons from the hydrogen atom are numerically simulated by using a semiclassical rescattering model (SRM) and solving the time-dependent Schr?dinger equation (TDSE), focusing on the role of the phase of the scattering amplitude. With the SRM, we find that the spiderlike legs shift to positions with smaller transverse momentum values while increasing the phase. The spiderlike patterns obtained by SRM and TDSE are in good agreement upon considering this phase. In addition, the time differences in electron ionization and rescattering calculated by SRM and the saddle-point equations are either in agreement or show very similar laws of variation, which further corroborates the significance of the phase of the scattering amplitude.
photoelectron holography semiclassical rescattering model spiderlike structure Chinese Optics Letters
2021, 19(7): 073201
