强激光场中分子隧穿电离位置的研究

项目名称： 强激光场中分子隧穿电离位置的研究

项目编号： No.11504302

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 黄诚

作者单位： 西南大学

项目金额： 20万元

中文摘要： 强场分子隧穿电离是强激光与分子相互作用最基本的过程之一，是诸如高次谐波产生、高阶阈上电离、非顺序双电离等一切后续强场过程的基础。对这些后续强场过程的机理研究和应用探索都依赖于对强场电离过程的理解。因而强场隧穿电离在过去的几十年里一直是强场物理领域的热点课题，科学家们开展了许多相关的实验和理论研究，获得了一些关于分子电离通道和隧穿位置的信息，但是其中的物理机理及其对靶材种类和激光参数的依赖关系尚不清楚，而现有的准静态物理图像也无法给出正确的解释和预测。基于此，本项目拟采用数值求解含时薛定谔方程的方法来研究强场分子隧穿电离中的超快动力学过程，探索强激光场中不同分子的电离通道和隧穿位置，获得强场分子电离通道和隧穿位置对靶材性质和激光参数的依赖关系，揭示其内在的物理机理。进一步研究不同电离通道和隧穿位置对后续强场物理过程的影响。本项目的研究将促进人们对强场分子隧穿电离更加深刻而全面的认识。

中文关键词： 隧穿位置；超快动力学；电离通道；强场过程

英文摘要： Strong field tunneling ionization of molecules is one of the most fundamental processes in intense laser- matter interactions. It is the basis of all subsequent strong filed processes, such as high-order harmonic generation, above-threshold ionization, non-sequential double ionization. Study on subsequent strong filed processes are dependent on the understanding of the tunneling ionization. Thus it was one of the hottest topics in the strong filed physics during the past decades. A large number of experimental and theoretical studies focused on the tunneling ionization of molecules. Some information of the ionization channel and the tunneling site have been obtained. But the corresponding physical mechanism and the dependence of the tunneling site on the target and laser parameters are unclear. The quasistatic physical picture cannot explain those phenomena and give some predictions. In this proposal, we plan to investigate the ultrafast dynamics in the tunneling ionization of molecules by numerically solving the time-dependent Schrodinger equation. We will explore the ionization channels and the tunneling site of the electron, obtain the dependence of the tunneling site on the target and laser parameters, and reveal the corresponding physical mechanism. Further, the effect of the ionization channel and tunneling site on the subsequent strong field process will be investigate. This study will promote people’s understanding on strong field tunneling ionization of molecules.

英文关键词： tunneling site;ultrafast dynamics;ionization channel;strong field process