强光场诱导的再散射过程的理论研究

项目名称： 强光场诱导的再散射过程的理论研究

项目编号： No.11274219

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 陈长进

作者单位： 汕头大学

项目金额： 71万元

中文摘要： 原子在强激光场中的非序列双电离（NSDI）是由强场诱导的返回电子与靶离子的再散射过程，研究该过程对于理解原子在激光场中的行为这一基本物理问题具有十分重要的意义。两维关联电子动量谱是迄今为止最为细致的关于NSDI的实验测量结果。准确计算NSDI的两维关联电子动量谱对理论工作者仍然极具挑战。近来，我们在经典三步模型的基础上提出了定量描述强场诱导的高阶域上电离过程的理论，称为QRS模型，并将该模型初步应用于NSDI。本项目旨在前期工作的基础上建立完善精确的定量描述NSDI的量子理论模型，准确计算NSDI过程的两维关联电子动量谱，并由此得到二价离子动量谱，进而对原子和分子的NSDI过程进行系统研究，包括NSDI对靶的依赖性、对场强的依赖性、对波长的依赖性、对激光场相位的依赖性和对分子空间取向的依赖性等一系列问题。

中文关键词： QRS模型；非次序双电离；强场诱导；再散射；散射截面

英文摘要： Nonsequential double ionization (NSDI) of atoms in strong laser pulses is one of the recattering processes between the laser-induced returning electron and the target ion. Recognition of the NSDI is one of the most important steps to advance the understanding of the behavior of atoms in laser field, which is a problem of fundermental physics. So far, the mesurements carried out in experiment which carry the most detailed information about the NSDI　processes are the two dimensional correlated electron momentum sepectra. It is still a great challenge for theoretical workers to calculate the correlated electron momentum spetra accurately. Recently, we have developed a quantitative re-scattering (QRS) model to describe the high-order above threshold ionization in strong laser pulses based on the classical three-step model, and have tried to apply the QRS model to the NSDI. Continuing on our previous work, this project focuses on setting up an accurate quantum-mechanical-based theoretical model for the NSDI. And then, with the established model, we will perform a systematic investigation of the NSDI on atoms and molecules, including the target-dependence, intensity-dependence, wavelength-dependence, the CEP(carrier-enevelope phase)-dependence and the effect of molecular alignment, by calculating the correlated elec

英文关键词： QRS model；nosequential double ionization；laser induced；rescattering；cross section