Very-high-order harmonic generation from Ar atoms and Ar{sup +} ions in superintense pulsed laser fields: An ab initio self-interaction-free time-dependent density-functional approach

Journal Article · Wed Jun 15 00:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.063813· OSTI ID:20717974

Carrera, Juan J; Chu, S -I ^[1]; Tong, X M ^[2]

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1. Department of Chemistry, University of Kansas, and Kansas Center for Advanced Scientific Computing, Lawrence, Kansas 66045 (United States)
2. J.R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, Kansas 66506 (United States)

We present an ab initio nonpertubative investigation of the mechanisms responsible for the production of very-high-order harmonic generation (HHG) from Ar atoms and Ar{sup +} ions by means of the self-interaction-free time-dependent density-functional theory recently developed. Further, by introducing an effective charge concept, we can study at which laser intensity the contribution to the high-energy HHG from Ar{sup +} ions precede over the Ar atoms. Comparing the HHG behavior from Ar atoms and Ar{sup +} ions in the superintense laser field, we conclude that the high-energy HHG observed in the recent experiment originated from the ionized Ar atoms.

• OSTI ID: 20717974
• Journal Information: Physical Review. A, Vol. 71, Issue 6; Other Information: DOI: 10.1103/PhysRevA.71.063813; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ARGON IONS
ATOMS
CATIONS
DENSITY FUNCTIONAL METHOD
EFFECTIVE CHARGE
HARMONIC GENERATION
LASER RADIATION
PHOTON-ATOM COLLISIONS
TIME DEPENDENCE