Methane activation by Ti/sup +/: electronic and translational energy dependence
Journal Article
·
· J. Phys. Chem.; (United States)
The reaction of Ti/sup +/ with methane is studied as a function of translational energy in a guided ion beam tandem mass spectrometer. The effect of electronic excitation is also studied by varying the conditions for forming Ti/sup +/. The a/sup 2/F excited state is found to form the two main products, TiH/sup +/ and TiCH/sub 2//sup +/, substantially more efficiently than the a/sup 4/F ground and b/sup 4/F first excited states. The results indicate that reaction occurs primarily through a doublet H-Ti/sup +/-CH/sub 3/ intermediate. The reactivities of the different electronic states of Ti/sup +/ can be explained by using simple molecular orbital concepts and spin conversation. The thresholds for these reactions and for related reactions in other systems are interpreted to give D/sup 0/(Ti/sup +/-H) = 54.2 +/- 2.5, D/sup 0/(Ti/sup +/-CH/sub 3/) = 57.5 +/- 2.8, D/sup 0/(Ti/sup +/-CH/sub 2/) = 93.4 +/- 3.5, and D/sup 0/(Ti/sup +/-CH) = 121 +/- 4, all in kcal/mol.
- Research Organization:
- Univ. of Utah, Salt Lake City (USA)
- OSTI ID:
- 7148524
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:5; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
BINDING ENERGY
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
COLLISIONS
DATA
ELECTRONIC STRUCTURE
ENERGY
ENERGY DEPENDENCE
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
GROUND STATES
HYDROCARBONS
INFORMATION
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
KINETIC ENERGY
LINEAR MOMENTUM
MASS SPECTROSCOPY
METHANE
MOLECULE COLLISIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
SPECTROSCOPY
THERMODYNAMICS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
400201* -- Chemical & Physicochemical Properties
ALKANES
BINDING ENERGY
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
COLLISIONS
DATA
ELECTRONIC STRUCTURE
ENERGY
ENERGY DEPENDENCE
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
GROUND STATES
HYDROCARBONS
INFORMATION
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
KINETIC ENERGY
LINEAR MOMENTUM
MASS SPECTROSCOPY
METHANE
MOLECULE COLLISIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
SPECTROSCOPY
THERMODYNAMICS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS