文档介绍：摘要上海师范大学硕士学位论文
提供了一种简单的方法。
(3) 借助特殊调制的周期量级激光脉冲,对 Ar 原子双电离过程进行深入研
究,检验了多次碰撞对关联电子动量分布的影响。我们采用梯形脉冲包络的线偏
振激光脉冲,发现关联电子的动量分布随激光脉冲中周期数变化:对于少周期激
光脉冲,电子主要分布在一三象限;随着激光脉冲的周期数增加,二四象限分布
逐渐增加。这是由于碰撞激发电离过程逐步增多导致的。通过增加 3 周期激光脉
冲的峰值强度,我们发现关联电子分布从反关联为主转换到正关联为主。这说明
电子与母核的多次碰撞不存在的情况下,关联电子的动量分布也会产生从反关联
到正关联的转换。
关键词:强场双电离、非序双电离、标度定律、电子关联、直接碰撞电离、碰撞
激发电离、周期量级激光脉冲、多次碰撞
论文类型:基础研究
II
Shanghai Normal University Master of Philosophy Abstract
Thesis theme: Correlated electron momentum distribution and
scaling law of atomic double ionization in strong laser field
Major: Condensed Matter Physics
Degree Applicant: Shansi Dong
Advisor: Prof. Jingtao Zhang
Abstract
Electron-electron correlation is a universal phenomenon in the microscopic
world. It was a major impact in formation of chemical bounds in chemical reaction,
the phenomenon of superconductivity, and the solid state properties, but also an
important part of attosecond physics. Strong field non-sequential double ionization
(NSDI) process provides a basic model for the study of electron-electron correlation,
and became a frontier of the strong-field laser physics.
In this paper, using the classical Monte Carlo method, the double ionization of
rare gas atoms in intense laser field, we established a scaling law of double ionization,
and tested the role of multiple collision by using few-cycle laser pulses of special
e