Intershell-correlation-induced time delay in atomic photoionization

Keating, David; Manson, S. T.; Dolmatov, V K; Mandal, Ankur; Deshmukh, P. C.; Naseem, Faiza; Kheifets, Anatoli

doi:10.1103/physreva.98.013420

Cited by 15 publications

(12 citation statements)

References 21 publications

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“…This contrasts with nonresonant time delays which are at the attosecond level. Thus, the time delays in the resonance region are about five orders of magnitude larger than nonresonant delays [10][11][12][13][16][17][18][19]; they are also considerably larger than the delays in the vicinity of a similar resonance in Ar [23].…”

Section: Resultsmentioning

confidence: 89%

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Strong dependence of photoionization time delay on energy and angle in the neighborhood of Fano resonances

et al. 2019

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We uncover dramatic variations of the Wigner photoemission time delay with energy and angle in the vicinity of a Fano resonance with the time delay taking opposite signs at different angles at the same energy as well as at the opposite sides of the resonance at the same angle. These variations are illustrated by choosing the Ne 2s → 3p autoionizing state as a case study. Moreover, we demonstrate the existence of strikingly significant changes in time delay due to relativistic effects despite Ne being a low-Z atom. This finding shows the possibility for utilizing time delay chronoscopy as a new route towards experimental probing of relativistic interactions and the phases of individual transition matrix elements upon atomic photoionization of low-Z atoms. Finally, we develop a practical parameterization to model and explain the angle and energy variation of the autoionizing resonance time delay in the non-relativistic limit.

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Section: Resultsmentioning

confidence: 89%

“…An early review can be found in [9]. Later works are represented by [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Most of these investigations have involved nonresonant photoemission.…”

Section: Introductionmentioning

confidence: 99%

Strong dependence of photoionization time delay on energy and angle in the neighborhood of Fano resonances

et al. 2019

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“…The relativistic electric dipole amplitude, for a linearly polarized light along the z-direction, for a transition from an initial state, nljm , to a final state,κljm, is given by [14] […”

Section: Theoretical Methodsmentioning

confidence: 99%

“…One needs a very sophisticated and advanced theoretical methodology to accurately probe the ultrafast electronic motion and study this subatomic world. With the impetus of two pioneering experimental investigations [2,3], photoionization time delay studies, as a means of investigating attosecond phenomena, have gained quite a bit of attention in recent years; a selection of some of this work can be found in [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. State-of-the-art experimental techniques have succeeded in probing the time domain in photoionization processes.…”

Section: Introductionmentioning

confidence: 99%

Wigner time delay in photodetachment

et al. 2019

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Using Cl − as a test case, Wigner time delay in the photodetachment process has been investigated theoretically, along with the photoionization of the isoelectronic Ar atom, for the outer 3p shell using the relativistic-random-phase approximation (RRPA). Time delay was probed in these systems from threshold to 80 eV, to investigate threshold effects, the centrifugal barrier shape resonance and the Cooper minimum region. This study focusses on Cl − because, for negative ions, the phase of the photoemission process is not dominated by the Coulomb phase as it is in photoionization. The results show significant differences, both qualitative and quantitative, between the time delays for Cl − and Ar photoemission at low photoelectron energy, but they are rather similar in the Cooper minimum region, where the Coulomb phase is small. In particular, the Wigner time delay in Cl − exhibits dramatic energy dependence just above threshold, and a rapidly increasing time delay in the vicinity of the shape resonance. A strong angular dependence of time delay has also been found near the threshold region for Cl − case; and absent in case of photoionization of Ar. The origin of these phenomenologies is explained and a prospectus for future work is presented.

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“…In the present work, we study τ W ES which bears the signature of the ionization process. Earlier work has shown that the Wigner-Eisenbud-Smith time delay is very sensitive to electron correlations, especially in the energy region of autoionization resonances [9,13,14,16,22,23,28], near Cooper minima [29], and in the vicinity or inner-shell thresholds [21].…”

Section: Introductionmentioning

confidence: 99%

Effects of spin-orbit-interaction-activated interchannel coupling on photoemission time delay

et al. 2020

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Spin-orbit interaction activated interchannel coupling (SOIAIC) has been investigated theoretically in the time delay domain for 3d photoemission in the isoelectronic sequence I − , Xe and Cs + using the relativistic-random-phase approximation with relaxation (RRPA-R). The results show that SOIAIC becomes more important with increasing nuclear charge, and that time delay is affected more strongly than cross sections or photoelectron angular distribution β parameters.

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Intershell-correlation-induced time delay in atomic photoionization

Cited by 15 publications

References 21 publications

Strong dependence of photoionization time delay on energy and angle in the neighborhood of Fano resonances

Strong dependence of photoionization time delay on energy and angle in the neighborhood of Fano resonances

Wigner time delay in photodetachment

Effects of spin-orbit-interaction-activated interchannel coupling on photoemission time delay

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