Nonsequential double ionization of Ar in near-single-cycle laser pulses

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Chen, Zhangjin
Liu, Fang
Wen, Hua
Morishita, Toru
Zatsarinny, Oleg
Bartschat, Klaus
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2020
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Abstract

Using the improved quantitative rescattering (QRS) model, we simulate the correlated two-electron momentum distributions (CMD) for nonsequential double ionization (NSDI) of Ar by near-single-cycle laser pulses with a wavelength of 750 nm at an intensity of 2.8 × 1014 W/cm2. With the accurate cross sections obtained from fully quantum mechanical calculations for both electron impact excitation and electron impact ionization of Ar+, we unambiguously identify the contributions from recollision direct ionization (RDI) and recollision excitation with subsequent ionization (RESI). Our analysis reveals that RESI constitutes the main contribution to NSDI of Ar under the conditions considered here. The simulated results are directly compared with experimental measurements [Bergues et al., Nat. Commun. 3, 813 (2012) [CrossRef] ] in which each NSDI event is tagged with the carrier-envelope phase (CEP). It is found that the overall pattern of both the CEP-resolved and the CEP-averaged CMDs measured in experiment are well reproduced by the QRS model, and the cross-shaped structure in the CEP-averaged CMD is attributed to the strong forward scattering of the recolliding electron as well as the depletion effect in tunneling ionization of the electron from an excited state of the parent ion.

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Optics Express
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28
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15
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© 2020 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
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Atomic, molecular and optical physics
Electrical engineering
Electronics, sensors and digital hardware
Communications engineering
Science & Technology
Physical Sciences
Optics
ELECTRON-IMPACT IONIZATION
DISTORTED-WAVE CALCULATION
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Chen, Z; Liu, F; Wen, H; Morishita, T; Zatsarinny, O; Bartschat, K, Nonsequential double ionization of Ar in near-single-cycle laser pulses, Optics Express, 2020, 28 (15), pp. 22231-22246
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