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

• Verfasst von: Ma, Huanyu [VerfasserIn]
• Verfasst von: Wang, Xincheng [VerfasserIn]
• Verfasst von: Zhang, Linxuan [VerfasserIn]
• Verfasst von: Zou, Zhihan [VerfasserIn]
• Verfasst von: Yuan, Junyang [VerfasserIn]
• Verfasst von: Ma, Yixuan [VerfasserIn]
• Verfasst von: Lv, Rujin [VerfasserIn]
• Verfasst von: Shen, Zhenjie [VerfasserIn]
• Verfasst von: Yan, Tianmin [VerfasserIn]
• Verfasst von: Weidemüller, Matthias [VerfasserIn]
• Verfasst von: Ye, Difa [VerfasserIn]
• Verfasst von: Jiang, Yuhai [VerfasserIn]
• Titel: Few-photon single ionization of cold rubidium in the over-the-barrier regime
• Verf.angabe: 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
• E-Jahr: 2023
• Jahr: March 2023
• Umfang: 9 S.
• Fussnoten: Gesehen am 13.06.2023
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2023
• Band/Heft Quelle: 107(2023), 3 vom: März, Artikel-ID 033114, Seite 1-9
• ISSN Quelle: 2469-9934
• DOI: doi:10.1103/PhysRevA.107.033114
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1848864191

Abstract

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.