Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session F02: Virtual Poster Session (4:00pm-6:00pm, PT)
4:00 PM,
Tuesday, June 6, 2023
Room: Virtual Platform
Chair: Jianming Wen, Kennesaw State University
Abstract: F02.00025 : Ab initio - calculated streaked and angle-resolved direct and shake-up photoemission spectra for helium*
Presenter:
Hongyu Shi
(Kansas State University)
Authors:
Hongyu Shi
(Kansas State University)
Uwe Thumm
(Kansas State University)
Collaboration:
We thank Keegan Finger for his help in performing part of the numerical convergence tests.
task. By implementing an adaptive FE-DVR method to efficiently solve the two-electron
time-dependent Schrödinger equation, we calculated ab initio attosecond time-resolved spectra for
streaked XUV photoemission from helium. For the n=2 shake-up channel, we find photoemission time-delays relative to direct photoemission in agreement with the experimental and calculated results of
M. Ossiander et al [Nature Phys 13, 280 (2017)] and provide relative photoemission delays for the n=3 shake up channel. Within a multipole expansion and by comparing our ab initio results for angle-resolved spectra with a simplified single-active-electron calculation, we examine the contributions of the lowest multipole orders of the residual He+(n=2,3) charge distributions on the photoemission delay.
*Supported in parts by US DOE grant DEFG02-86ER13491 and US NSF grant PHY 2110633.
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