Coulomb-induced emission time shifts in high-order harmonic generation from H + 2

被引:0
作者
Li, Yangyang [1 ,2 ]
Song, Siqi [1 ,2 ]
Han, Yongkang [1 ,2 ]
Yue, Shengjun [1 ,2 ]
Du, Hongchuan
机构
[1] Lanzhou Univ, Frontiers Sci Ctr Rare Isotopes, Lanzhou 730000, Peoples R China
[2] Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
来源
OPTICS EXPRESS | 2024年 / 32卷 / 11期
基金
中国国家自然科学基金;
关键词
IONIZATION; INTERFERENCE; RADIATION; ELECTRONS; FIELD; IONS; ATOM;
D O I
10.1364/OE.522826
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Accurate emission times of high -order harmonic generation (HHG) are vital for highprecision ultrafast detection in attosecond science, but a quantitative analysis of Coulomb effects on this time is absent in the molecular HHG. Here, we investigate the Coulomb -induced emissiontime shift in HHG of H + 2 with two different internuclear distances R , where the times obtained via the Gabor transform of numerical data from solving the time -dependent Schr & ouml;dinger equation are used as simulation experiment results. Based on the molecular strong -field approximation, we develop a trajectory -resolved classical model that takes into account the molecular two -center structure. By selecting appropriate electron trajectories and including Coulomb interactions, the classical trajectory method can reproduce Gabor emission times well. This consistence reveals that Coulomb tails cause an emission -time shift of - 35 as at the R = 2.0 a.u. case and of - 40-60 as at the R = 2.6 a.u. case under the present laser parameters when compared to the Coulomb -free quantum -orbit model. Our results are of significance to probe the attosecond dynamics via two -center interference.
引用
收藏
页码:18984 / 18996
页数:13
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