Energetics and reaction mechanisms of SiH/sup +/ + D/sub 2/ and SiD/sup +/ + H/sub 2/ and collision-induced dissociation of SiD/sub 3//sup +/
The title reactions are investigated by guided ion beam mass spectrometry. Absolute cross sections are determined as a function of the relative collision energy. In the reaction of SiH/sup +/ with D/sub 2/, the lowest energy process is the near thermoneutral H/D exchange reaction. At energies above about 2 eV, several minor processes are observed: deuterium atom transfer to form SiHD/sup +/, H/D/sub 2/ exchange to yield SiD/sub 2//sup +/, and collision-induced dissociation into Si/sup +/ and H. The reaction of SiD/sup +/ + H/sub 2/ is observed to have analogous product channels with nearly identical energy behaviors. The translational energy dependence of the collision-induced dissociation of SiD/sub 3//sup +/ is shown to correlate well with the reaction of SiH/sup +/ (SiD/sup +/) + D/sub 2/ (H/sub 2/). This supports the intermediacy of SiHD/sub 2//sup +/ (SiH/sub 2/D/sup +/) for the H/D isotope exchange reaction. The thermochemistry of all these reactions is in good agreement with previous studies indicates that there are no activation barriers in excess of the endothermicities.
- Research Organization:
- Univ. of California, Berkeley
- OSTI ID:
- 5796925
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 91:22
- Country of Publication:
- United States
- Language:
- English
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Isotope exchange during the thermal decomposition of a SiH/sub 4/-SiD/sub 4/ mixture
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
DEUTERIUM
CHEMICAL REACTIONS
ISOTOPE EFFECTS
HYDROGEN
SILANES
DISSOCIATION
CATIONS
EV RANGE 01-10
EXPERIMENTAL DATA
ION-MOLECULE COLLISIONS
MASS SPECTROSCOPY
CHARGED PARTICLES
COLLISIONS
DATA
ELEMENTS
ENERGY RANGE
EV RANGE
HYDRIDES
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INFORMATION
ION COLLISIONS
IONS
ISOTOPES
LIGHT NUCLEI
MOLECULE COLLISIONS
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
SILICON COMPOUNDS
SPECTROSCOPY
STABLE ISOTOPES
400201* - Chemical & Physicochemical Properties
640304 - Atomic
Molecular & Chemical Physics- Collision Phenomena
400202 - Isotope Effects
Isotope Exchange
& Isotope Separation