Time dependent aspects in the ionizations following atomic photoexcitations

Koike, Fumihiro

doi:10.1016/j.nimb.2008.10.045

Nuclear Instruments and Methods in Physics Research Section B:

2009

DOI: 10.1016/j.nimb.2008.10.045

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Time dependent aspects in the ionizations following atomic photoexcitations

Fumihiro Koike

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Cited by 2 publications

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“…The profile formula given in Eq. ( 3) has been applied to the cascading Auger decay after the Ar K-shell photoionization [6] and the theory has well reproduced the TEPICO spectra by Hayaishi et al [7].…”

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confidence: 79%

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Fluorescence Time Delay in Multistep Auger Decay as an Internal Clock

et al. 2020

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Differences in postcollision interaction (PCI) effects on Kr L 3 M 4;5 M 4;5 Auger electron spectra were observed, depending on whether the initial photoionization occurred slightly above the K threshold or slightly above the L 3 threshold. For the former, KL fluorescence emission most likely happens and then Auger processes due to the L 3 hole follow. The time delay due to fluorescence causes a reduced shift of the Auger peak and tailing toward lower energy, since the Auger overtaking of the photoelectron happens later in time and at a location farther away from the ionic core, compared to the case for the simple one-step L 3 M 4;5 M 4;5 Auger decay after L-shell photoionization. Time-dependent theory for PCI in multistep processes agrees well with experiment, illustrating the effect as an internal clock for the time-sequence of the dynamical process.

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confidence: 79%

“…In atomic inner-shell photoionization processes near threshold, post-collision interaction (PCI) between the photoelectron and subsequently emitted Auger electrons occurs [1][2][3][4][5][6][7][8][9][10][11][12]. Generally, PCI is described as a sudden Coulomb potential change due to the fast Auger electrons overtaking a slow photoelectron.…”

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confidence: 99%

Fluorescence Time Delay in Multistep Auger Decay as an Internal Clock

et al. 2020

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Postcollision-interaction effects in multistep Auger transitions following Ar 1s photoionization

et al. 2022

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Post Collision Interaction (PCI) effects involving multi-step decay processes following Ar 1s photoionization has been studied by Auger electron spectroscopy. The experiment focused on LMM Auger electrons measured in small photon energy steps across the Ar 1s photoionization threshold. Decay pathways that we studied include 1) Ar + * 2p -1 →Ar 2+ 3p -2 LMMα Auger process due to a single L hole created by KL fluorescence, 2) Ar 2+* 2p -2 → Ar 3+ * 2p -1 3p -2 LMM1 Auger process following double L shell hole states produced by a KLL Auger processes and 3) the subsequent Ar 3+ * 2p -1 3p -2 → Ar 4+ 3p -4 LMM2 Auger transitions. Particularly pronounced PCI shifts and unusual line shapes compared to the ordinary one-step PCI process were found in the spectra of Auger processes following a KLL Auger first step. The experimental results were compared with calculations based on the semi-classical approach to PCI. Good agreement was found between the calculated and experimental PCI shifts. The result opens possibilities for further studies of the multielectron dynamics between Auger electrons mediated through the photoelectron in these and similar systems.

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Time dependent aspects in the ionizations following atomic photoexcitations

Cited by 2 publications

References 18 publications

Fluorescence Time Delay in Multistep Auger Decay as an Internal Clock

Fluorescence Time Delay in Multistep Auger Decay as an Internal Clock

Postcollision-interaction effects in multistep Auger transitions following Ar 1s photoionization

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