Ellipticity dependence of excitation and ionization of argon atoms by short-pulse infrared radiation
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Author(s)
Pauly, Thomas
Bondy, Aaron
Hamilton, Kathryn R
Douguet, Nicolas
Tong, Xiao-Min
Chetty, Dashavir
Bartschat, Klaus
Year published
2020
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When atoms or molecules are exposed to strong short-pulse infrared radiation, ionization as well as "frustrated tunneling ionization"can occur, in which some of the nearly freed electrons recombine into the initial ground or an excited bound state. We analyze the ellipticity dependence of the relative signals that are predicted in a single-active-electron (SAE) approximation, the validity of which is checked against a parameter-free multielectron R-matrix (close-coupling) with time-dependence approach. We find good agreement between the results from both models, thereby providing confidence in the SAE model potential to treat ...
View more >When atoms or molecules are exposed to strong short-pulse infrared radiation, ionization as well as "frustrated tunneling ionization"can occur, in which some of the nearly freed electrons recombine into the initial ground or an excited bound state. We analyze the ellipticity dependence of the relative signals that are predicted in a single-active-electron (SAE) approximation, the validity of which is checked against a parameter-free multielectron R-matrix (close-coupling) with time-dependence approach. We find good agreement between the results from both models, thereby providing confidence in the SAE model potential to treat the process of interest. Comparison of the relative excitation probabilities found in our numerical calculations with the predictions of Landsman et al. [A. S. Landsman, New J. Phys. 15, 013001 (2013)NJOPFM1367-263010.1088/1367-2630/15/1/013001] and Zhao et al. [Y. Zhao, Opt. Express 27, 21689 (2019)OPEXFF1094-408710.1364/OE.27.021689] reveals good agreement with the former for short pulses. For longer pulses, the ellipticity dependence becomes wider than that obtained from the Landsman et al. formula, but we do not obtain the increase compared to linearly polarized radiation predicted by Zhao et al.
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View more >When atoms or molecules are exposed to strong short-pulse infrared radiation, ionization as well as "frustrated tunneling ionization"can occur, in which some of the nearly freed electrons recombine into the initial ground or an excited bound state. We analyze the ellipticity dependence of the relative signals that are predicted in a single-active-electron (SAE) approximation, the validity of which is checked against a parameter-free multielectron R-matrix (close-coupling) with time-dependence approach. We find good agreement between the results from both models, thereby providing confidence in the SAE model potential to treat the process of interest. Comparison of the relative excitation probabilities found in our numerical calculations with the predictions of Landsman et al. [A. S. Landsman, New J. Phys. 15, 013001 (2013)NJOPFM1367-263010.1088/1367-2630/15/1/013001] and Zhao et al. [Y. Zhao, Opt. Express 27, 21689 (2019)OPEXFF1094-408710.1364/OE.27.021689] reveals good agreement with the former for short pulses. For longer pulses, the ellipticity dependence becomes wider than that obtained from the Landsman et al. formula, but we do not obtain the increase compared to linearly polarized radiation predicted by Zhao et al.
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Journal Title
Physical Review A
Volume
102
Issue
1
Copyright Statement
© 2020 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Subject
Atomic, molecular and optical physics
Nuclear and plasma physics
Particle and high energy physics
Science & Technology
Physical Sciences
Optics