Ab initio - calculated streaked and angle-resolved direct and shake-up photoemission spectra for helium
POSTER
Abstract
Understanding the correlated ionization dynamics in atoms has remained a challenging
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.
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.
Publication: none
Presenters
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Hongyu Shi
- Kansas State University