Decoding the electron dynamics in high-order harmonic generation from asymmetric molecular ions in elliptically polarized laser fields
Cai-Ping Zhang(张彩萍)1,2 and Xiang-Yang Miao(苗向阳)1,2,†
1 College of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China; 2 Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, Shanxi Normal University, Taiyuan 030031, China
Abstract The high-order harmonic generation from an asymmetric molecular ion is theoretically investigated based on the Born-Oppenheimer model with two-dimensional electron dynamics. It is shown that the harmonic intensity changes periodically in elliptically polarized laser fields. The periodical character is ellipticity-dependent. By establishing the physical image, the periodicity of the harmonic intensity can be ascribed to the contributions of the ground state and the excited state. Furthermore, the electron dynamics from different electronic states can be selected via combining the elliptically polarized laser field with a static electric field. The harmonics dominated either by ground state or excited state are emitted once in an optical cycle in the combined laser field.
(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 11974229, 11404204, and 11947002) and the Scientific and Technological Innovation Program of Higher Education Institutions in Shanxi, China (Grant No. 2021L255).
Cai-Ping Zhang(张彩萍) and Xiang-Yang Miao(苗向阳) Decoding the electron dynamics in high-order harmonic generation from asymmetric molecular ions in elliptically polarized laser fields 2022 Chin. Phys. B 31 043301
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