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Few-photon single ionization of cold rubidium in the over-the-barrier regime

Photoionization of rubidium atoms cooled in a magneto-optical trap, characterized by the coexistence of the ground 5S1/2 and excited 5P3/2 states, is investigated experimentally and theoretically with the 400-nm femtosecond laser pulses at intensities of I=(3×109)-(4.5×1012) W/cm2. The recoil-ion mo...

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Main Authors: Ma, Huanyu (Author) , Wang, Xincheng (Author) , Zhang, Linxuan (Author) , Zou, Zhihan (Author) , Yuan, Junyang (Author) , Ma, Yixuan (Author) , Lv, Rujin (Author) , Shen, Zhenjie (Author) , Yan, Tianmin (Author) , Weidemüller, Matthias (Author) , Ye, Difa (Author) , Jiang, Yuhai (Author)
Format: Article (Journal)
Language:English
Published: March 2023
In: Physical review
Year: 2023, Volume: 107, Issue: 3, Pages: 1-9
ISSN:2469-9934
DOI:10.1103/PhysRevA.107.033114
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevA.107.033114
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevA.107.033114
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Author Notes:Huanyu Ma, Xincheng Wang, Linxuan Zhang, Zhihan Zou, Junyang Yuan, Yixuan Ma, Rujin Lv, Zhenjie Shen, Tianmin Yan, Matthias Weidemüller, Difa Ye, and Yuhai Jiang
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Summary:Photoionization of rubidium atoms cooled in a magneto-optical trap, characterized by the coexistence of the ground 5S1/2 and excited 5P3/2 states, is investigated experimentally and theoretically with the 400-nm femtosecond laser pulses at intensities of I=(3×109)-(4.5×1012) W/cm2. The recoil-ion momentum distribution (RIMD) of Rb+ exhibits rich ringlike structures and their energies correspond to one-photon ionization of the 5P3/2 state and two-photon and three-photon ionizations of the 5S1/2 state, respectively. With increasing I, the dips near zero momentum (NZM) in the experimental RIMDs become shallow dramatically and their peaked Rb+ momenta ionized from the 5P3/2 state move obviously toward zero while the peaks from the 5S1/2 state do not shift. In addition, the ion-yield ratio of the 5S1/2 state to the 5P3/2 state varies from I to I1.5 as I increases. These features indicate a transition from perturbative ionization to strongly perturbative ionization for the 5P3/2 state. Numerical simulations by solving the time-dependent Schrödinger equation (TDSE) can qualitatively explain the measurements of the RIMD, photoion angular distributions, and ion-yield ratio. However, some discrepancies still exist, especially for the NZM dip, which could stem from the electron-electron correlation that is neglected in the present TDSE simulations since we have adopted the single-active-electron approximation.
Item Description:Gesehen am 13.06.2023
Physical Description:Online Resource
ISSN:2469-9934
DOI:10.1103/PhysRevA.107.033114

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