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

Banerjee, Sourav; Deshmukh, Pranawa C.; Dolmatov, Valeriy K.; Manson, Steven T.; Kheifets, Anatoli S.

doi:10.1103/physreva.99.013416

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

Journal Article · 14 January 2019 · Physical Review A

DOI: https://doi.org/10.1103/physreva.99.013416 · OSTI ID:1609425

Banerjee, Sourav ^[1]; Deshmukh, Pranawa C. ^[2]; Dolmatov, Valeriy K. ^[3]; Manson, Steven T. ^[4]; Kheifets, Anatoli S. ^[5]

Indian Inst. of Technology (IIT), Madras (India); DOE/OSTI
Indian Inst. of Technology (IIT), Tirupati (India)
Univ. of Northern Alabama, Florence, AL (United States)
Georgia State Univ., Atlanta, GA (United States)
Australian National Univ., Canberra, ACT (Australia)

In this work, 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 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 parametrization to model and explain the angle and energy variation of the autoionizing resonance time delay in the nonrelativistic limit.

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Research Organization:: Georgia State Univ., Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: FG02-03ER15428

OSTI ID:: 1609425

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 1 Vol. 99; ISSN PLRAAN; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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