Absolute state-selected and state-to-state total cross sections for the Ar sup + ( sup 2 P sub 3/2,1/2 )+CO reactions

Journal Article · Sun Sep 01 04:00:00 EDT 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.460843· OSTI ID:5388655

Flesch, G D; Nourbakhsh, S; Ng, C Y ^[1]

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1. Iowa State University, Ames, Iowa (USA). Ames Laboratory Iowa State University, Ames, Iowa (USA). Department of Chemistry

Absolute spin--orbit state-selected total cross sections for the reactions, Ar{sup +}({sup 2}{ital P}{sub 3/2,1/2})+CO{r arrow}CO{sup +}+Ar (reaction (1)), C{sup +}+O+Ar (reaction (2)), O{sup +}+C+Ar (reaction (3)), and ArC{sup +}+O (reaction (4)), have been measured in the center-of-mass collision energy ({ital E}{sub c.m.}) range of 0.04--123.5 eV. Absolute spin--orbit state transition total cross sections for the Ar{sup +}({sup 2}{ital P}{sub 3/2,1/2})+CO reactions at {ital E}{sub c.m.} have also been obtained. The appearance energies (AE) for C{sup +}({ital E}{sub c.m.}=6.6{plus minus}0.4 eV) and O{sup +}({ital E}{sub c.m.}=8.6{plus minus}0.4 eV) are in agreement with the thermochemical thresholds for reactions (2) and (3), respectively. The observed AE for reaction (4) yields a lower bound of 0.5 eV for the ArC{sup +} bond dissociation energy. The kinetic energy dependence of the absolute cross sections and the retarding potential analysis of the product ions support that ArC{sup +}, C{sup +}, and O{sup +} are formed via a charge transfer predissociation mechanism, similar to that proposed to be responsible for the formation of O{sup +} (N{sup +}) and ArO{sup +} (ArN{sup +}) in the collisions of Ar{sup +}({sup 2}{ital P}{sub 3/2,1/2})+O{sub 2}(N{sub 2}).

• OSTI ID: 5388655
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:5; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ARGON IONS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHARGE EXCHANGE
CHARGED PARTICLES
CHEMICAL REACTIONS
CROSS SECTIONS
DISSOCIATION
ENERGY LEVELS
ENERGY RANGE
EV RANGE
IONS
MILLI EV RANGE
OXIDES
OXYGEN COMPOUNDS
P STATES
PREDISSOCIATION
TOTAL CROSS SECTIONS