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Title: Threshold shift and above-threshold multiphoton ionization of atomic hydrogen in intense laser fields

Abstract

Accurate ab initio nonperturbative L/sup 2/ non-Hermitian Floquet calculations for intensity-dependent threshold shifts and ground-state total ionization widths (rates) for one-, two-, and three-photon-dominant intense-field ionization of atomic hydrogen are presented. The results show the importance of both the ac Stark shift and the pondermotive potential in the determination of the net threshold shift. In addition, branching ratios to individual continua have been estimated, yielding physical insights regarding the general features and mechanisms of the frequency- and intensity-dependent continuum-continuum transitions and ''peak switching'' phenomena in the above-threshold ionization processes.

Authors:
;
Publication Date:
Research Org.:
Joint Institute for Laboratory Astrophysics, University of Colorado; National Bureau of Standards, Boulder, Colorado 80309
OSTI Identifier:
6238285
Resource Type:
Journal Article
Journal Name:
Phys. Rev. A; (United States)
Additional Journal Information:
Journal Volume: 32:5
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; HYDROGEN; PHOTON-ATOM COLLISIONS; FLOQUET FUNCTION; LASER RADIATION; MULTI-PHOTON PROCESSES; PHOTOIONIZATION; SPECTRAL SHIFT; THRESHOLD ENERGY; ATOM COLLISIONS; COLLISIONS; ELECTROMAGNETIC RADIATION; ELEMENTS; ENERGY; FUNCTIONS; IONIZATION; NONMETALS; PHOTON COLLISIONS; RADIATIONS; 640302* - Atomic, Molecular & Chemical Physics- Atomic & Molecular Properties & Theory

Citation Formats

Chu, S., and Cooper, J. Threshold shift and above-threshold multiphoton ionization of atomic hydrogen in intense laser fields. United States: N. p., 1985. Web. doi:10.1103/PhysRevA.32.2769.
Chu, S., & Cooper, J. Threshold shift and above-threshold multiphoton ionization of atomic hydrogen in intense laser fields. United States. doi:10.1103/PhysRevA.32.2769.
Chu, S., and Cooper, J. Fri . "Threshold shift and above-threshold multiphoton ionization of atomic hydrogen in intense laser fields". United States. doi:10.1103/PhysRevA.32.2769.
@article{osti_6238285,
title = {Threshold shift and above-threshold multiphoton ionization of atomic hydrogen in intense laser fields},
author = {Chu, S. and Cooper, J.},
abstractNote = {Accurate ab initio nonperturbative L/sup 2/ non-Hermitian Floquet calculations for intensity-dependent threshold shifts and ground-state total ionization widths (rates) for one-, two-, and three-photon-dominant intense-field ionization of atomic hydrogen are presented. The results show the importance of both the ac Stark shift and the pondermotive potential in the determination of the net threshold shift. In addition, branching ratios to individual continua have been estimated, yielding physical insights regarding the general features and mechanisms of the frequency- and intensity-dependent continuum-continuum transitions and ''peak switching'' phenomena in the above-threshold ionization processes.},
doi = {10.1103/PhysRevA.32.2769},
journal = {Phys. Rev. A; (United States)},
number = ,
volume = 32:5,
place = {United States},
year = {1985},
month = {11}
}