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 00:00:00 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), Vol. 95:5; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

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