Translational and electronic energy dependence of chromium ion reactions with methane
The reaction of Cr/sup +/ with methane is studied as a function of translational and electronic energy in a guided ion beam tandem mass spectrometer. The electronic energy of the Cr/sup +/ ion is varied by altering the ionization technique. The ground-state Cr/sup +/(/sup 6/S) is found to react endothermically with CH/sub 4/ to produce CrH/sup +/, CrCH/sub 2//sup +/, and CrCH/sub 3//sup +/. Only the former product has been observed previously for the reaction of ground-state Cr/sup +/. Excited states (/sup 4/D and possibly /sup 4/G) of Cr/sup +/ react with much higher efficiency to form the same products, while Cr/sup +/(/sup 6/D), the first excited state, exhibits no evidence of reaction. The results are interpreted by using simple molecular orbital concepts that have been developed previously for reactions of transition-metal ions. This model is shown to explain the observation by Ridge and co-workers that the quartet excited states of Cr/sup +/ are efficiently quenched by methane in a spin-forbidden process.
- Research Organization:
- Univ. of California, Berkeley (USA)
- OSTI ID:
- 6189036
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:25; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ALKANES
BEAMS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
DATA
ELECTRONIC STRUCTURE
ENERGY
ENERGY DEPENDENCE
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GASES
HYDROCARBONS
INFORMATION
ION BEAMS
IONS
KINETIC ENERGY
MASS SPECTROMETERS
MEASURING INSTRUMENTS
METHANE
NUMERICAL DATA
ORGANIC COMPOUNDS
SPECTROMETERS
TRANSITION ELEMENT COMPOUNDS