氢原子在红外激光和极紫外脉冲组合场中的阈上电离  

Above-threshold ionization of hydrogen atom in the combined field of infrared and extreme ultraviolet laser pulses

作　　者：王娜 景文泉 管仲[1] 杨增强 赵松峰[1] WANG Na;JING Wen-Quan;GUAN Zhong;YANG Zeng-Qiang;ZHAO Song-Feng(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730030,China;Department of Physics,School of Arts and Sciences,Shaanxi University of Science&Technology,Xi'an 710021,China)

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070 [2]陕西科技大学文理学院物理系,西安710021

出　　处：《原子与分子物理学报》2021年第6期101-107,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);陕西省教育厅专项科研计划项目(18JK0098);陕西科技大学科研启动基金(2017BJ-30)。

摘　　要：通过求解氢原子在强红外(IR)激光和极紫外(XUV)脉冲组合场中的三维含时薛定谔方程(TDSE),理论研究了XUV脉冲的加入对光电子能谱和二维光电子动量分布的影响.计算结果表明,与仅由红外场驱动的情况相比,组合场驱动下的光电子能谱和二维光电子动量分布中呈现出明显的干涉增强结构,干涉结构对XUV脉冲的强度、光子能量和时间延迟都有很强的依赖,该方案可实现高能阈上电离谱的选择性增强.By solving the three dimensional time-dependent Schr9 dinger equation(TDSE) of hydrogen atom in the combined field of infrared and extreme ultraviolet(XUV) laser pulses, the influence of XUV pulse on the photoelectron energy spectra and two dimensional photoelectron momentum distribution(PMD) was studied theoretically. Our results show that, compared with the infrared laser only case, photoelectron energy spectra and two dimensional photoelectron momentum distribution driven by the combined field present an obvious interference enhanced structure, which is intensively dependent on the intensity, photon energy and time delay of XUV pulse. The present method can be used to selectively enhance the high energy above-threshold ionization spectra.

关 键 词：阈上电离 组合场 干涉增强结构 

分 类 号：O65[理学—分析化学]