Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session V01: Poster Session III (4:00-6:00pm, EDT)
4:00 PM,
Thursday, June 2, 2022
Room: Grand Ballroom C
Abstract: V01.00097 : Multichannel photoelectron phase lag across atomic barium autoionizing resonances*
Presenter:
Yimeng Wang
(Purdue University)
Authors:
Yimeng Wang
(Purdue University)
Chris H Greene
(Purdue University)
Although previous theoretical studies have treated the phase lag across resonances in model calculations, the quantitative agreement has never been achieved between the theoretical model and experimental measurement of the phase lag from the ω-2ω ionization of atomic barium. Yamazaki and Elliot, PhysRevLett.98.053001(2007), PhysRevA.76.053401(2007), suggest that a toy model with phenomenological parameters is inadequate to describe the observed phase lag behavior.
Here the phase lag is treated quantitatively in a multichannel coupling formulation, and our calculation based on a multichannel quantum defect and R-matrix treatment achieves good agreement with the experimental observations. Our treatment also develops formulas to describe the effects of hyperfine depolarization on multiphoton ionization processes. Moreover, we identify resonances between Ba+ 5d3/2 and 5d5/2 thresholds that have apparently never been experimentally observed and classified. This work has been published as Phys. Rev. A. 105, 013113 (2022).
*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award No. DESC0010545
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