Above-threshold-dissociation dynamics of H[sub 2][sup +] with short intense laser pulses

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.46.5845· OSTI ID:7174265

Jolicard, G ^[1]; Atabek, O ^[2]

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1. Laboratoire de Physique Moleculaire, Faculte des Sciences de Besancon, La Bouloie, route de Gray, 25030 Besancon CEDEX (France)
2. Laboratoire de Photophysique Moleculaire du CNRS, Batiment 213, Universite de Paris (enSud, 91405 Orsay CEDEX (France))

A rigorous time-dependent wave-operator method within the Bloch formalism is presented and applied to the calculation of the photodissociation rate of H[sub 2][sup +] in intense pulsed laser fields. The wave packet is simultaneously propagated on the radiatively coupled ground and electronically excited potential-energy surfaces of the ion, combining a Lanczos reduction technique at low orders and recursive time-dependent Bloch operators. Dissociation rates are extracted from an asymptotic-flow analysis in the momentum space. The energy distributions of the protons, resulting from multiphoton absorption above the dissociation threshold, consist of a sequence of peaks spaced by half of the photon energy. The distribution of higher-energy peaks decreases with increasing intensity, due to stimulated emission from dissociating fragments. Time-resolved dynamics reached by ultrashort intense pulses ([congruent]20-fs duration and peak intensity varying in the range from 3.5[times]10[sup 12] to 3.5[times]10[sup 14] W/cm[sup 2]) leads to a thorough interpretation of photon-exchange mechanisms between the field and the ion during the excitation and fragmentation steps.

• OSTI ID: 7174265
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 46:9; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
BINDING ENERGY
CATIONS
CHARGED PARTICLES
DISSOCIATION
DYNAMICS
ELECTROMAGNETIC RADIATION
ENERGY
HYDROGEN IONS
HYDROGEN IONS 2 PLUS
IONS
KINETICS
LASER RADIATION
MECHANICS
MOLECULAR IONS
PULSES
RADIATIONS