The Coulomb potential influence in the attoclock experimental scheme
Coulomb potential may induce a significant angular offset to the 2-dimensional photoelectron momentum distributions for atoms subject to strong elliptically polarized laser field. In the attoclock experiment, this offset usually cannot easily be disentangled from the contribution of tunneling delay and poses a main obstacle to the precise measurement of tunneling delay. Based on semiclassical calculations, here we propose a method to extract the equivalent temporal offset induced solely by Coulomb potential (TOCP) in an attoclock experiments. Our calculations indicate that, at constant laser intensity, the TOCP show distinctive wavelength dependence laws for different model atoms and the ratio of the target atom''s TOCP to that of H becomes insensitive to wavelength and linearly proportional to (2I_p )^(-3⁄2), where I_p is the ionization potential of the target atom. This wavelength and I_p dependence of TOCP can be further applied to extract the Coulomb potential influence. Our work paves the way for an accurate measurement of the tunneling delay in the tunneling ionization of atoms subject to intense elliptically polarized laser field.
作者单位：Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences
Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences
Institute of Applied Physics and Computational Mathematics
Xiao ZhiLei,Quan Wei,Xu SongPo,Yu ShaoGang,Wang YanLan,Zhao Meng,Wei MingZheng,Zhou Yu,Lai Xuan-yang,Chen(陈京) Jing,Liu Xiaojun. The Coulomb potential influence in the attoclock experimental scheme[J].Chinese Optics Letters,2020,18(1):01.