一维模型氢原子在啁啾激光场中的阈上电离  

Above-threshold ionization of one-dimensional model hydrogen atom in chirped laser fields

作　　者：景文泉 管仲[1] 赵松峰[1] JING Wen-Quan;GUAN Zhong;ZHAO Song-Feng(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China)

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070

出　　处：《原子与分子物理学报》2021年第2期92-98,共7页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11664035);西北师范大学青年教师科研能力提升计划(NWNU-LKQN-17-1)。

摘　　要：通过数值求解一维模型氢原子在啁啾激光场中的含时薛定谔方程,研究了在不同电离机制下啁啾率对阈上电离能谱的影响.计算结果表明,三种不同电离区域的光电子能谱对啁啾率的依赖程度不同.结合激发束缚态的总布居,阐明了多光子阈上电离能谱的啁啾依赖主要源自于激发束缚态的贡献.而单光子和隧穿电离区,电子可通过吸收单个光子或隧穿势垒到达连续态,因此激发束缚态的影响较小.另外,隧穿电离区光电子能谱第一个平台截止位置对啁啾率的依赖可归结于激发束缚态的贡献.We theoretically investigate the chirp dependence of above-threshold ionization energy spectra of onedimensional model hydrogen atom in chirped laser pulses by solving the time-dependent Schrdinger equation.We show different chirp dependences of photoelectron energy spectra at three different ionization regimes.Using the total population of excited bound states,we clarify that the chirp dependence of photoelectron spectra in the multiphoton ionization regime can originate from the contribution of excited bound states.In the single-photon and tunneling ionization regimes,since the active electron can get to the continuum states mainly by absorbing a single photon or by tunneling through the Coulomb potential barrier,thus excited bound states may be less important.Furthermore,the chirp dependence of the cutoff position for the first plateau in the photoelectron spectra can also be traced back to the contribution of excited bound states in the tunneling ionization case.

关 键 词：阈上电离 啁啾激光 含时薛定谔方程 

分 类 号：O65[理学—分析化学]