首页|Momentum distributions of symmetric(H2+)and asymmetric(HeH2+)molecular ions in a circularly polarized laser field under different ionization mechanisms

Momentum distributions of symmetric(H2+)and asymmetric(HeH2+)molecular ions in a circularly polarized laser field under different ionization mechanisms

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Momentum distributions of symmetric(H2+)and asymmetric(HeH2+)molecular ions in a circularly polarized laser field under different ionization mechanisms
By numerically solving the two-dimensional(2D)time-dependent Schrödinger equation(TDSE),we present photo-electron momentum distributions(PMDs)and photoelectron angular distributions(PADs)of symmetric(H2+)and asymmet-ric(HeH2+)molecular ions in circularly polarized(CP)laser pulses.By adjusting the laser wavelength,two circumstances of resonance excitation and direct ionization were considered.The ionization mechanism of the resonance excitation was mainly investigated.The results show that the PMDs of H2+and HeH2+in the y-direction gradually increase with increas-ing intensity,and the number of PMDs lobes is in good agreement with the results predicted by the ultrafast ionization model.In the resonance excitation scenario,the PMDs of H+are dominated by two-photon ionization,whereas the PMDs of HeH2+are dominated by three-photon ionization.Furthermore,the PMDs of HeH2+are stronger in the resonance ex-citation scenario than those of H+,which can be explained by the time-dependent population of electrons.In addition,the molecular structure is clearly imprinted onto the PMDs.

resonance excitationtime-dependent Schrödinger equationultrafast ionization modelphotoelec-tron momentum distributions

郝欣宇、闫淑娟、郭颖、郭静

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Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China

resonance excitation time-dependent Schrödinger equation ultrafast ionization model photoelec-tron momentum distributions

2024

10.1088/1674-1056/ad7c2b

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(12)