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Title: Wigner time delay in photodetachment

Abstract

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 focuses 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 a 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 the Cl - case, and is absent in the case of the photoionization of Ar. The origin of these phenomenologies is explained and a prospectusmore » for future work is presented.« less

Authors:
 [1];  [2];  [3];  [1];  [4];  [5];  [6]
  1. Indian Inst. of Technology (IIT), Madras (India)
  2. Indian Inst. of Technology (IIT), Patna (India)
  3. Indian Inst. of Technology (IIT), Tirupati (India); Indian Institute of Science Education and Research, Tirupati (India)
  4. Univ. of North Alabama, Florence, AL (United States)
  5. Australian National Univ., Canberra, ACT (Australia)
  6. Georgia State Univ., Atlanta, GA (United States)
Publication Date:
Research Org.:
Georgia State Univ., Atlanta, GA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; USDOE
OSTI Identifier:
1505773
Alternate Identifier(s):
OSTI ID: 1505845
Grant/Contract Number:  
FG02-03ER15428
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 99; Journal Issue: 4; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; Attosecond time delay; photodetachment; photo emission

Citation Formats

Saha, Soumyajit, Jose, Jobin, Deshmukh, Pranawa C., Aravind, G., Dolmatov, Valeriy K., Kheifets, Anatoli S., and Manson, Steven T. Wigner time delay in photodetachment. United States: N. p., 2019. Web. doi:10.1103/PhysRevA.99.043407.
Saha, Soumyajit, Jose, Jobin, Deshmukh, Pranawa C., Aravind, G., Dolmatov, Valeriy K., Kheifets, Anatoli S., & Manson, Steven T. Wigner time delay in photodetachment. United States. doi:10.1103/PhysRevA.99.043407.
Saha, Soumyajit, Jose, Jobin, Deshmukh, Pranawa C., Aravind, G., Dolmatov, Valeriy K., Kheifets, Anatoli S., and Manson, Steven T. Mon . "Wigner time delay in photodetachment". United States. doi:10.1103/PhysRevA.99.043407.
@article{osti_1505773,
title = {Wigner time delay in photodetachment},
author = {Saha, Soumyajit and Jose, Jobin and Deshmukh, Pranawa C. and Aravind, G. and Dolmatov, Valeriy K. and Kheifets, Anatoli S. and Manson, Steven T.},
abstractNote = {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 focuses 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 a 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 the Cl- case, and is absent in the case of the photoionization of Ar. The origin of these phenomenologies is explained and a prospectus for future work is presented.},
doi = {10.1103/PhysRevA.99.043407},
journal = {Physical Review A},
number = 4,
volume = 99,
place = {United States},
year = {2019},
month = {4}
}

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