Origin of double-line structure in nonsequential double ionization by few-cycle laser pulses

Journal Article · Thu Jul 28 00:00:00 EDT 2016 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4959188· OSTI ID:22679047

Huang, Cheng; Zhong, Mingmin; Wu, Zhengmao ^[1]

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1. School of Physical Science and Technology, Southwest University, Chongqing 400715 (China)

We investigate nonsequential double ionization (NSDI) of molecules by few-cycle laser pulses at the laser intensity of 1.2–1.5 × 10{sup 14} W/cm{sup 2} using the classical ensemble model. The same double-line structure as the lower intensity (1.0 × 10{sup 14} W/cm{sup 2}) is also observed in the correlated electron momentum spectra for 1.2–1.4 × 10{sup 14} W/cm{sup 2}. However, in contrast to the lower intensity where NSDI proceeds only through the recollision-induced double excitation with subsequent ionization (RDESI) mechanism, here, the recollision-induced excitation with subsequent ionization (RESI) mechanism has a more significant contribution to NSDI. This indicates that RDESI is not necessary for the formation of the double-line structure and RESI can give rise to the same type of structure independently. Furthermore, we explore the ultrafast dynamics underlying the formation of the double-line structure in RESI.

• OSTI ID: 22679047
• Journal Information: Journal of Chemical Physics, Vol. 145, Issue 4; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELECTRON CORRELATION
ELECTRON SPECTRA
EXPERIMENTAL DATA
IONIZATION
LASERS
PULSES