强场原子电离响应时间的研究进展  

Advances in response time of strong-field ionization of atoms

作　　者：车佳殷 陈超 李卫艳 李维[4] 陈彦军[2] Che Jia-Yin;Chen Chao;Li Wei-Yan;Li Wei;Chen Yan-Jun(Hebei Key Laboratory of Optoelectronic Information and Geo-detection Technology,School of Mathematics and Science,Hebei GEO University,Shijiazhuang 050031,China;College of Physics and Information Technology,Shaanxi Normal University,Xi’an 710119,China;College of Physics and Electronic Engineering,Xingtai University,Xingtai 054001,China;Beijing Institute of Space Mechanics and Electricity,China Academy of Space Technology,Beijing 100094,China)

机构地区：[1]河北地质大学数理学院,河北省光电信息与地球探测技术重点实验室,石家庄050031 [2]陕西师范大学物理学与信息技术学院,西安710119 [3]邢台学院物理与电子工程学院,邢台054001 [4]中国空间技术研究院,北京空间机电研究所,北京100094

出　　处：《物理学报》2023年第19期33-47,共15页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12174239)资助的课题。

摘　　要：光电效应中电子对光的响应时间很难定义与测量.强场隧穿电离是一种强激光诱导的光电效应,该过程中的响应时间将改变高次谐波辐射时间,进而对利用谐波重构电子阿秒动力学产生根本影响.本文提出了一个简洁的理论来处理强场原子隧穿电离中的响应时间问题.响应时间对应于库仑-电子-外场三体强相互作用时间,可在量子经典边界处确定.通过响应时间直接得到的观测量可以定量重现近年系列阿秒钟实验曲线,并为这些实验提供一致的解释.本文详细介绍响应时间理论的研究进展及工作展望,例如在隧穿二极管设计中的潜在应用.The response time of the electron to light in photoemission is difficult to define and measure.The tunneling ionization of atoms and molecules in a strong laser field is a type of strong field-induced photoelectric effect.In this process,the electron response time will change the time of high-order harmonic generation(HHG),which will have a fundamental influence on the reconstruction of electron attosecond dynamics through HHG.We propose a simple theory to resolve the response time problem in strong field atomic tunneling ionization.The response time corresponds to the strong interaction time of three bodies i.e.Coulomb,electron and laser field,which can be determined at the quantum-classical boundary.The observable directly obtained through response time can quantitatively reproduce a series of attoclock experimental curves and provide consistent explanations for these experimental phenomena.This work introduces the main conclusions of response time theory and summarizes in detail the research progress of this theory.Firstly,this theory can be applied to the orthogonal two-color laser field to quantitatively explain the main characteristic structures of photoelectron momentum distribution(PMD).Besides,with this response time theory,the scaling law of the observable in attoclock experiment can be obtained.The proposal of scaling law is expected to provide a systematical theoretical guide for better understanding the applicability or feasibility of the attoclock under different conditions.In addition,based on the atomic response time theory,we further consider the property of multi-center Coulomb potential of molecular and develop a response time theory suitable for molecular system.Subsequently,we further apply the response time theory to polar molecules,by utilizing the asymmetry of PMD closely related to response time to recognize the permanent dipole(PD)effect within the laser sub-cycle.In the end,we discuss the prospects for research on response time.Firstly,it is envisioned to further apply response time the

关 键 词：光电效应 隧穿电离 响应时间 阿秒测量 

分 类 号：O562.4[理学—原子与分子物理]