项目名称: 强场隧穿电子再碰撞动力学研究
项目编号: No.11274051
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: 刘杰
作者单位: 北京应用物理与计算数学研究所
项目金额: 88万元
中文摘要: 强激光与物质相互作用涉及原子的高剥离过程、带电粒子加速乃至超强场中的真空极化及正负电子对产生,是当今物理学的重要前沿研究领域,具有很强的基础性与探索性。强激光中原子的电离过程是研究强激光与各种复杂物质形态相互作用的基础,展现出非微扰、多体关联主导的复杂动力学行为。其中,隧穿电子在强激光驱动下与母核发生再碰撞过程,将导致高能的阈上电离能谱、非序列多重电离、再俘获引起的稳定化以及高次谐波发射等新奇现象,是强场物理研究的核心问题之一。本项目旨在应用量子理论、半经典轨道模拟方法结合最新实验进展,深入研究再碰撞过程中的多电子关联效应及母核的库仑聚焦效应。探讨通过再碰撞过程探索原子分子内部阿秒尺度的电子运动及结构变化的可行方法。对相关问题的深入研究,将有助于了解极端光场中物质微观动力学机理,在阿秒脉冲产生、分子轨道层析成像以及新型辐射源(X光源、中子源)方面也有潜在应用。
中文关键词: 再散射;隧穿电离;电子关联;阿秒过程;分子结构成像
英文摘要: Fundamental and exploratory research on the interaction of intense laser with matter, including ionization of highly charged ions and charged particle acceleration and vacuum polarization in extreme field and electron-positron pair production, become the most significant frontier fields of scientific research in today's physics. Ionization of atoms in intense laser fields is the basic physical processes of the interaction of intense laser with variety of complex physical forms, and show nonperturbative and multibody correlative complex dynamical behavior. In particular, tunneling electron is driven by the intense laser that recollide with its parent ion, the above process can cause many novel phenomenon, for instance, high energy above threshold ionization spectra, nonsequential multiple ionization, recombined stabilization and high-order harmonic generation .etc. The research on this topic has been central to understanding and harnessing strong field physics. This project aims to research many electron correlation effects and Coulomb focusing in the recollision process through combining theories and the latest experiment in quantum theory and semiclassical trajectory simulation. Explore possible way to probe internal electronic motion on the attosecond time scale and structural changes of atoms or molecules via
英文关键词: rescattering;tunneling ionizatjon;electron correlation;attosecond process;reconstruction of molecular structure