Resonant two photon dissociation dynamics of HD sup + in intense infrared laser field

Journal Article · Sat Jun 15 04:00:00 EDT 1991 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.460164· OSTI ID:5595058

Datta, B; Bhattacharyya, S S ^[1]

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1. Atomic and Molecular Physics Section, Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Calcutta-700 032, India (IN)

The intensity dependent line shapes of resonant two photon dissociation process in HD{sup +} from the 1{ital s}{sigma}{sub {ital g}} ({ital v}=6, {ital J}=0) are obtained at three different intensities (1.53{times}10{sup 10}, 1.53{times}10{sup 12}, and 6.12{times}10{sup 12} W/cm{sup 2} ) in the wavelength range 16 000--17 200 A using the resolvent operator formalism. The discrete state {ital v}=11, {ital J}=1 (1{ital s}{sigma}{sub {ital g}}) is the intermediate resonant state. The position of the resonance on the wavelength scale depends strongly on intensity. It is shown that for sufficiently strong fields the earlier semiperturbative theory formulated in analogy with Fano's theory of atomic autoionization breaks down near resonance due to saturation of the strongly coupled resonant transition. Also, when the dissociative transitions to both the electronic states 1{ital s}{sigma}{sub {ital g}} and 2{ital p}{sigma}{sub {ital u}} are considered simultaneously, the line shape is altered from that obtained by the superposition of the line shapes of these two transitions separately. The conditions under which a unique time independent transition rate is ill defined are discussed. For such situations the time dependent transition probabilities can be obtained from the effective Fano asymmetry parameters, and line shifts and widths of the ground and resonant states. The limiting transition rates for such cases for short and long pulse times are also shown.

• OSTI ID: 5595058
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 94:12; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
CHARGED PARTICLES
CHEMICAL REACTIONS
DECOMPOSITION
DEUTERIDES
DEUTERIUM COMPOUNDS
DISSOCIATION
ELECTROMAGNETIC RADIATION
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
INFRARED RADIATION
IONS
LASER RADIATION
LINE WIDTHS
MOLECULAR IONS
MULTI-PHOTON PROCESSES
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONS
SPECTRA