The dynamics of electronic to vibrational, rotational, and translational energy transfer in collision of Ba( sup 1 P sub 1 ) with diatomic molecules

Journal Article · Tue Sep 15 00:00:00 EDT 1992 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.463914· OSTI ID:7252469

Suits, A G; de Pujo, P; Sublemontier, O; Visticot, J; Berlande, J; Cuvellier, J; Gustavsson, T; Mestdagh, J; Meynadier, P ^[1]; Lee, Y T ^[2]

---

1. Service des Photons, Atomes et Molecules, DRECAM SPAM, Centre d'Etudes Nucleaires de Saclay, 91191 Gif-sur-Yvette Cedex (France)
2. Chemical Sciences Division, Lawrence Berkeley Laboratory and Department of Chemistry, University of California, Berkeley, California 94720 (United States)

Doppler measurements taken over a range of probe-laser angles in a crossed-beam experiment were used, in conjunction with forward convolution analysis, to obtain flux--velocity contour maps for Ba({sup 3}{ital P}{sub 2}) produced in a collision of Ba({sup 1}{ital P}{sub 1}) with H{sub 2}, N{sub 2}, O{sub 2}, and NO. The contour maps suggest a general model for the dynamics of this process in which large impact parameter collisions result in a near-resonant transfer of initial electronic energy into final vibrational energy, while close collisions produce sideways scattering and effectively couple electronic energy to translation. The molecular collision partners fall into two categories: for one group, comprising O{sub 2} and NO, the existence of a well-defined molecular anion with favorable Franck--Condon factors linking excited vibrational levels to the ground vibrational state of the neutral results in greatly enhanced coupling for the near-resonant process. Molecules for which there exist no stable anions, such as N{sub 2} and H{sub 2}, represent a second category. The electronically inelastic collision for this group is instead dominated by the nonresonant process yielding the ground vibrational state and large translational energy release.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7252469
• Journal Information: Journal of Chemical Physics; (United States), Vol. 97:6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOM-MOLECULE COLLISIONS
ENERGY TRANSFER
BARIUM
HYDROGEN
NITRIC OXIDE
NITROGEN
OXYGEN
COLLIDING BEAMS
DOPPLER EFFECT
ELECTRONIC STRUCTURE
EXCITED STATES
GROUND STATES
INELASTIC SCATTERING
LASERS
RESONANCE
ROTATIONAL STATES
VIBRATIONAL STATES
ALKALINE EARTH METALS
ATOM COLLISIONS
BEAMS
CHALCOGENIDES
COLLISIONS
ELEMENTS
ENERGY LEVELS
METALS
MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
664300* - Atomic & Molecular Physics- Collision Phenomena- (1992-)