Role of high-lying electronic states on the angular distribution of photofragments in multiphoton dissociation of D{sub 2}{sup +} by intense laser fields

Journal Article · Thu May 01 04:00:00 EDT 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.67.053403· OSTI ID:20636393

Sen, Sanjay; Dutta, Bibhas; Bhattacharyya, S S; Saha, Samir ^[1]

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

We have theoretically investigated the role of high lying electronic states 2p{pi}{sub u} and 3d{sigma}{sub g} on multiphoton dissociation of D{sub 2}{sup +} from initial vibrational-rotational levels v{sub i}=4,5 and J{sub i}=0,1 by linearly polarized light with wavelength 400 nm and intensity 3x10{sup 13} W/cm{sup 2}. We have found that for initial level v{sub i}=4 and J{sub i}=1, a considerable number of photofragments is ejected perpendicular to the polarization direction of the laser field. It is shown that the perpendicular dissociation is due to the (net) four-photon absorption of the ground 1s{sigma}{sub g} state to the 3d{sigma}{sub g} state through the intermediate five-photon coupling of the 1s{sigma}{sub g} and 2p{pi}{sub u} states at intense laser field with high frequency. Our computed value of the emission of D{sup +} ions in the perpendicular direction to that in the parallel direction of the laser polarization reasonably agrees with the recent experimental result of Chin and co-workers at the same laser parameters [Phys. Rev. A 62, 042708 (2000)].

• OSTI ID: 20636393
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 67; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
ANGULAR DISTRIBUTION
CATIONS
COUPLING
DEUTERIUM
DEUTERIUM IONS
DISSOCIATION
EMISSION
GROUND STATES
LASER RADIATION
MULTI-PHOTON PROCESSES
PHOTONS
POLARIZATION
VIBRATIONAL STATES
VISIBLE RADIATION
WAVELENGTHS