Reactive collision with excited states in a crossed beam experiment: O( sup 1 D )+H sub 2 ( v ) r arrow OH( A sup 2. Sigma. sup + )+H

Journal Article · Fri Jun 15 04:00:00 EDT 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.458219· OSTI ID:6807227

Lebehot, A; Drawin, S; Aguillon, F; Campargue, R ^[1]; Chapuisat, X ^[2]

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1. Centre d'Etudes Nucleaires de Saclay, DLPC-Service de Physique et de Physico-Chimie, Laboratoire des Jets Moleculaires, 91191 Gif-sur-Yvette Cedex, (France)
2. Universite de Paris-Sud, Laboratoire de Chimie Theorique (CNRS, UA 506), 91405 Orsay Cedex, (France)

At least for its most probable mechanisms, the reaction O({sup 1}{ital D})+H{sub 2}({ital X} {sup 1}{summation}{sup +}{sub {ital g}}) {r arrow}OH({ital A} {sup 2}{summation}{sup +})+H(1 {sup 2}{ital S}) entirely takes place, from reagents to products, on electronically excited-state channels. Due to its endoergicity and to probable energy barriers ({ital E}*{approx}2.8 eV) encountered on these channels, the reaction can be produced in a crossed beam experiment only if the hydrogen molecule is excited on high vibrational levels ({ital v}{ge}5 or {ital v}{ge}7, according to the presence or the absence of energy barriers). This is obtained here by low-energy electron bombardment of the H{sub 2} molecular beam. The reaction is observed through the spontaneous fluorescence of the product OH. The measured spectrum corresponding to the 0--0 band of the {ital A} {sup 2}{summation}{sup +}{r arrow}{ital X} {sup 2}{Pi} transition is compared to simulated spectra, as obtained with a simple statistical model and with fitted rotational distribution for OH({ital A} {sup 2}{summation}{sup +},{ital v}=0): a broad rotational distribution and a strongly nonstatistical effect on the spin doublet populations are observed.

• OSTI ID: 6807227
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 92:12; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
ATOMIC BEAMS
BEAMS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
HYDROGEN
HYDROXYL RADICALS
MOLECULAR BEAMS
MOLECULE COLLISIONS
NONMETALS
OXYGEN
RADICALS
ROTATIONAL STATES
YIELDS