Wigner-Eisenbud-Smith photoionization time delay due to autoioinization resonances

P. C. Deshmukh; A. Kumar; H. R. Varma; S. Banerjee; Steven T. Manson; V. K. Dolmatov; A. S. Kheifets

doi:10.1088/1361-6455/aaae33

Wigner-Eisenbud-Smith photoionization time delay due to autoioinization resonances

P. C. Deshmukh, A. Kumar, H. R. Varma^*, S. Banerjee, Steven T. Manson, V. K. Dolmatov, A. S. Kheifets

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

An empirical ansatz for the complex photoionization amplitude and Wigner-Eisenbud-Smith time delay in the vicinity of a Fano autoionization resonance are proposed to evaluate and interpret the time delay in the resonant region. The utility of this expression is evaluated in comparison with accurate numerical calculations employing the ab initio relativistic random phase approximation and relativistic multichannel quantum defect theory. The indisputably good qualitative agreement (and semiquantitative agreement) between corresponding results of the proposed model and results produced by the ab initio theories proves the usability of the model. In addition, the phenomenology of the time delay in the vicinity of multichannel autoionizing resonances is detailed.

Original language	English
Article number	065008
Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Volume	51
Issue number	6
DOIs	https://doi.org/10.1088/1361-6455/aaae33
Publication status	Published - 5 Mar 2018

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title = "Wigner-Eisenbud-Smith photoionization time delay due to autoioinization resonances",

abstract = "An empirical ansatz for the complex photoionization amplitude and Wigner-Eisenbud-Smith time delay in the vicinity of a Fano autoionization resonance are proposed to evaluate and interpret the time delay in the resonant region. The utility of this expression is evaluated in comparison with accurate numerical calculations employing the ab initio relativistic random phase approximation and relativistic multichannel quantum defect theory. The indisputably good qualitative agreement (and semiquantitative agreement) between corresponding results of the proposed model and results produced by the ab initio theories proves the usability of the model. In addition, the phenomenology of the time delay in the vicinity of multichannel autoionizing resonances is detailed.",

keywords = "Fano parametrisation, Wigner-Eisenbud-Smith time delay, autoionization, relativistic multichannel quantum defect theory, relativistic random phase approximation",

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T1 - Wigner-Eisenbud-Smith photoionization time delay due to autoioinization resonances

AU - Deshmukh, P. C.

AU - Kumar, A.

AU - Varma, H. R.

AU - Banerjee, S.

AU - Manson, Steven T.

AU - Dolmatov, V. K.

AU - Kheifets, A. S.

PY - 2018/3/5

Y1 - 2018/3/5

N2 - An empirical ansatz for the complex photoionization amplitude and Wigner-Eisenbud-Smith time delay in the vicinity of a Fano autoionization resonance are proposed to evaluate and interpret the time delay in the resonant region. The utility of this expression is evaluated in comparison with accurate numerical calculations employing the ab initio relativistic random phase approximation and relativistic multichannel quantum defect theory. The indisputably good qualitative agreement (and semiquantitative agreement) between corresponding results of the proposed model and results produced by the ab initio theories proves the usability of the model. In addition, the phenomenology of the time delay in the vicinity of multichannel autoionizing resonances is detailed.

AB - An empirical ansatz for the complex photoionization amplitude and Wigner-Eisenbud-Smith time delay in the vicinity of a Fano autoionization resonance are proposed to evaluate and interpret the time delay in the resonant region. The utility of this expression is evaluated in comparison with accurate numerical calculations employing the ab initio relativistic random phase approximation and relativistic multichannel quantum defect theory. The indisputably good qualitative agreement (and semiquantitative agreement) between corresponding results of the proposed model and results produced by the ab initio theories proves the usability of the model. In addition, the phenomenology of the time delay in the vicinity of multichannel autoionizing resonances is detailed.

KW - Fano parametrisation

KW - Wigner-Eisenbud-Smith time delay

KW - autoionization

KW - relativistic multichannel quantum defect theory

KW - relativistic random phase approximation

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DO - 10.1088/1361-6455/aaae33

M3 - Article

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JO - Journal of Physics B: Atomic, Molecular and Optical Physics

JF - Journal of Physics B: Atomic, Molecular and Optical Physics

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M1 - 065008

ER -

Wigner-Eisenbud-Smith photoionization time delay due to autoioinization resonances

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