项目名称: 强激光场中的原子阿秒动力学过程
项目编号: No.10874245
项目类型: 面上项目
立项/批准年度: 2009
项目学科: 原子能技术
项目作者: 赵增秀
作者单位: 中国人民解放军国防科学技术大学
项目金额: 35万元
中文摘要: 阿秒尺度的电子动力学是超短强激光脉冲与原子体系相互作用产生的重要物理过程,决定了超短强激光脉冲驱动下原子的电离、辐射等特性。本课题致力于发展理论的方法和数值计算的手段,模拟和研究多电子体系与强激光场的相互作用,揭示分子与强场相互作用导致的隧穿电离和高次谐波产生的细致机理,通过数值模拟与半解析理论相结合,系统研究分子结构、振动状态和电子关联对谐波产生和层析成像的影响,探索如何利用高次谐波确定分子轨道结构及动力变化,发展相干超宽带辐射产生理论和方法,研究对原子动力学过程的强光调控和利用阿秒脉冲探测各种物理化学超快过程。首次提出了对原子的电子轨道自旋态的层析成像;分析分子振动和解离谐波的强度和截断能量的影响,提出基于高次谐波谱对分子振动和解离的动力学成像;提出利用谐波极化,研究多电子关联效应和提高分子轨道重构的分辨率;研究了相干态布据分子的谐波产生,分析多通道高次谐波产生的干涉,和基于此种干涉探测谐波的啁啾特性及电子局域性。
中文关键词: 阿秒;高次谐波;隧穿电离;多电子;电子关联
英文摘要: Attosecond time scale electron dynamics is the dominant process during the interaction of ultrashort intense laser pulse with atomic systems and is crucial in determining the chracter of ionization and radiation of atoms. We focus on the development of theoretical models and numerical methods to describing the strong interaction between atoms and laser pulses. Combining both routines, we investigate the effects of atomic structures, vibration states and electron correlation on high-order harmonic generation. Futhermore , we are aiming to deepen the understanding of generation and measurement of supercontinuum, from considering the probe by attosecond pulses and controlling atomic dynamics. Our results show: it is possible to image spin statistics and molecular dissociation dynamics from high-order harmonics; the multi-electron correlation has profound effects on the polarization of hamonics. We studies the harmonic generation from molecules populated coherently and investigate the interference between different recombination channels. Based on our founding, we show that the chirp of harmonics and the localization of electron can be measured as well.
英文关键词: attosecond;high-order harmonic;tunneling ionization;multielectron;correlation