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Title: Asymmetries in ionization of atomic superposition states by ultrashort laser pulses

Abstract

Abstract Progress in ultrafast science allows for probing quantum superposition states with ultrashort laser pulses in the new regime where several linear and nonlinear ionization pathways compete. Interferences of pathways can be observed in the photoelectron angular distribution and in the past they have been analyzed for atoms and molecules in a single quantum state via anisotropy and asymmetry parameters. Those conventional parameters, however, do not provide comprehensive tools for probing superposition states in the emerging research area of bright and ultrashort light sources, such as free-electron lasers and high-order harmonic generation. We propose a new set of generalized asymmetry parameters which are sensitive to interference effects in the photoionization and the interplay of competing pathways as the laser pulse duration is shortened and the laser intensity is increased. The relevance of the parameters is demonstrated using results of state-of-the-art numerical solutions of the time-dependent Schrödinger equation for ionization of helium atom and neon atom.

Authors:
ORCiD logo; ;
Publication Date:
Research Org.:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); National Science Foundation (NSF)
OSTI Identifier:
1668881
Alternate Identifier(s):
OSTI ID: 1764715
Grant/Contract Number:  
SC0001771; PHY-1734006
Resource Type:
Published Article
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Name: Scientific Reports Journal Volume: 10 Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; Atomic and molecular interactions with photons; Attosecond science

Citation Formats

Venzke, J., Becker, A., and Jaron-Becker, A. Asymmetries in ionization of atomic superposition states by ultrashort laser pulses. United Kingdom: N. p., 2020. Web. https://doi.org/10.1038/s41598-020-73196-9.
Venzke, J., Becker, A., & Jaron-Becker, A. Asymmetries in ionization of atomic superposition states by ultrashort laser pulses. United Kingdom. https://doi.org/10.1038/s41598-020-73196-9
Venzke, J., Becker, A., and Jaron-Becker, A. Wed . "Asymmetries in ionization of atomic superposition states by ultrashort laser pulses". United Kingdom. https://doi.org/10.1038/s41598-020-73196-9.
@article{osti_1668881,
title = {Asymmetries in ionization of atomic superposition states by ultrashort laser pulses},
author = {Venzke, J. and Becker, A. and Jaron-Becker, A.},
abstractNote = {Abstract Progress in ultrafast science allows for probing quantum superposition states with ultrashort laser pulses in the new regime where several linear and nonlinear ionization pathways compete. Interferences of pathways can be observed in the photoelectron angular distribution and in the past they have been analyzed for atoms and molecules in a single quantum state via anisotropy and asymmetry parameters. Those conventional parameters, however, do not provide comprehensive tools for probing superposition states in the emerging research area of bright and ultrashort light sources, such as free-electron lasers and high-order harmonic generation. We propose a new set of generalized asymmetry parameters which are sensitive to interference effects in the photoionization and the interplay of competing pathways as the laser pulse duration is shortened and the laser intensity is increased. The relevance of the parameters is demonstrated using results of state-of-the-art numerical solutions of the time-dependent Schrödinger equation for ionization of helium atom and neon atom.},
doi = {10.1038/s41598-020-73196-9},
journal = {Scientific Reports},
number = 1,
volume = 10,
place = {United Kingdom},
year = {2020},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1038/s41598-020-73196-9

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