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Title: Ionization of helium by an ultrashort extreme-ultraviolet laser pulse

Abstract

We theoretically study photoelectron angular distributions and related anisotropy parameters for the competition of one- and two-photon ionization of He in an ultrashort extreme-ultraviolet laser pulse, using numerical results from the time-dependent Schrödinger equation. We explore the transition between the two processes for variation of the pulse duration, peak intensity, and central frequency or photoelectron energy. In the results obtained for fixed pulse parameters the transition and interference between the processes can be observed in the even (β2, β4) and odd (β1, β3) parameters, respectively, while the onset of the impact of three-photon ionization is observed via β5 at high peak intensities. Lastly, we show that the transition can be observed via the even anisotropy parameters in pulses without carrier-to-envelope stabilization as well as in free-electron laser pulses with fluctuating pulse shape.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]
  1. Univ. of Colorado, Boulder, CO (United States)
Publication Date:
Research Org.:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
OSTI Identifier:
1712953
Grant/Contract Number:  
SC0001771; PHY-1734006
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. B, Atomic, Molecular and Optical Physics
Additional Journal Information:
Journal Volume: 53; Journal Issue: 8; Journal ID: ISSN 0953-4075
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ultrashort laser pulses; EUV laser pulses; ionization

Citation Formats

Venzke, J., Jaroń-Becker, A., and Becker, A.. Ionization of helium by an ultrashort extreme-ultraviolet laser pulse. United States: N. p., 2020. Web. https://doi.org/10.1088/1361-6455/ab728c.
Venzke, J., Jaroń-Becker, A., & Becker, A.. Ionization of helium by an ultrashort extreme-ultraviolet laser pulse. United States. https://doi.org/10.1088/1361-6455/ab728c
Venzke, J., Jaroń-Becker, A., and Becker, A.. Wed . "Ionization of helium by an ultrashort extreme-ultraviolet laser pulse". United States. https://doi.org/10.1088/1361-6455/ab728c. https://www.osti.gov/servlets/purl/1712953.
@article{osti_1712953,
title = {Ionization of helium by an ultrashort extreme-ultraviolet laser pulse},
author = {Venzke, J. and Jaroń-Becker, A. and Becker, A.},
abstractNote = {We theoretically study photoelectron angular distributions and related anisotropy parameters for the competition of one- and two-photon ionization of He in an ultrashort extreme-ultraviolet laser pulse, using numerical results from the time-dependent Schrödinger equation. We explore the transition between the two processes for variation of the pulse duration, peak intensity, and central frequency or photoelectron energy. In the results obtained for fixed pulse parameters the transition and interference between the processes can be observed in the even (β2, β4) and odd (β1, β3) parameters, respectively, while the onset of the impact of three-photon ionization is observed via β5 at high peak intensities. Lastly, we show that the transition can be observed via the even anisotropy parameters in pulses without carrier-to-envelope stabilization as well as in free-electron laser pulses with fluctuating pulse shape.},
doi = {10.1088/1361-6455/ab728c},
journal = {Journal of Physics. B, Atomic, Molecular and Optical Physics},
number = 8,
volume = 53,
place = {United States},
year = {2020},
month = {4}
}

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