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Ionization of helium by an ultrashort extreme-ultraviolet laser pulse

Journal Article · · Journal of Physics. B, Atomic, Molecular and Optical Physics
 [1];  [2];  [2]
  1. Univ. of Colorado, Boulder, CO (United States); JILA and Department of Physics, University of Colorado, Boulder
  2. Univ. of Colorado, Boulder, CO (United States)
+ Show Author Affiliations
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.
Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
National Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0001771
OSTI ID:
1712953
Alternate ID(s):
OSTI ID: 23011897
Journal Information:
Journal of Physics. B, Atomic, Molecular and Optical Physics, Journal Name: Journal of Physics. B, Atomic, Molecular and Optical Physics Journal Issue: 8 Vol. 53; ISSN 0953-4075
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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74 ATOMIC AND MOLECULAR PHYSICS
EUV laser pulses
ionization
ultrashort laser pulses