Absolute state-selected and state-to-state total cross sections for the reaction Ar sup + ( sup 2 P sub 3/2,1/2 )+O sub 2
- Ames Laboratory, U. S. Department of Energy, Ames, IA (US) Department of Chemistry, Iowa State University, Ames, Iowa 50011 (US)
Absolute spin--orbit state-selected total cross sections for the reactions, Ar{sup +}({sup 2}{ital P}{sub 3/2,1/2})+O{sub 2}{r arrow}O{sup +}{sub 2}+Ar (reaction (1)), O{sup +}+O+Ar (reaction (2)), and ArO{sup +}+O (reaction (3)), have been measured in the center-of-mass collision energy ({ital E}{sub c.m.}) range of 0.044--133.3 eV. Absolute spin--orbit state transition total cross sections for the Ar{sup +}({sup 2}{ital P}{sub 3/2,1/2})+O{sub 2} reaction at {ital E}{sub c.m.}=2.2--177.6 eV have also been examined. The appearance energies for the formation of O{sup +} ({ital E}{sub c.m.}=2.9{plus minus}0.2 eV) and ArO{sup +} (2.2{plus minus}0.2 eV) are in agreement with the thermochemical thresholds for reactions (2) and (3), respectively. The cross sections for O{sup +}{sub 2}, O{sup +}, and ArO{sup +} depend strongly on {ital E}{sub c.m.} and the spin--orbit states of Ar{sup +}, suggesting that reactions (1)--(3) are governed predominantly by couplings between electronic potential energy surfaces arising from the interactions of Ar{sup +}({sup 2}{ital P}{sub 3/2})+O{sub 2}, Ar{sup +}({sup 2}{ital P}{sub 1/2})+O{sub 2}, and O{sup +}{sub 2}+Ar.
- OSTI ID:
- 6962785
- Journal Information:
- Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 92:6; ISSN JCPSA; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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400201* -- Chemical & Physicochemical Properties
640304 -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON IONS
ATOMIC IONS
CHARGE EXCHANGE
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
COLLISIONS
CROSS SECTIONS
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EV RANGE 10-100
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
KINETICS
MOLECULE COLLISIONS
NONMETALS
OXYGEN
REACTION KINETICS
TOTAL CROSS SECTIONS