Evidence for valence hole localization in the Auger decay and fragmentation of carbon and silicon tetrafluorides
Journal Article
·
· J. Chem. Phys.; (United States)
Monochromatic synchrotron radiation was used to excite selectively core electrons of the carbon and fluorine atoms in carbon tetrafluoride and silicon and fluorine in silicon tetrafluoride. The fragmentation processes were examined using time-of-flight mass spectroscopy. The mass spectra show the distribution of ions collected in coincidence with low and high energy electrons. Distinct changes in the mass spectra with atomic site of excitation and photon energy are observed. The observation of F/sup 2 +/ ions following fluorine 1s excitation in SiF/sub 4/ provides significant evidence for a ''valence bond depopulation'' mechanism involving the formation of a localized, two-hole final state that persists on the time scale of fragmentation. In contrast, no F/sup 2 +/ was observed for CF/sub 4/, which indicates that fragmentation for this molecule is more characteristic of a delocalized two-hole state.
- Research Organization:
- Department of Chemistry, State University of New York, Stony Brook, New York 11794-3400
- OSTI ID:
- 6548967
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 90:4; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ACCELERATORS
BREMSSTRAHLUNG
CARBON TETRAFLUORIDE
CHEMICAL REACTIONS
CYCLIC ACCELERATORS
DECOMPOSITION
DISSOCIATION
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUORIDES
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
INNER-SHELL EXCITATION
MASS SPECTROSCOPY
NSLS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATION SOURCES
RADIATIONS
SILICON COMPOUNDS
SILICON FLUORIDES
SPECTROSCOPY
SYNCHROTRON RADIATION
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
VALENCE
400500* -- Photochemistry
ACCELERATORS
BREMSSTRAHLUNG
CARBON TETRAFLUORIDE
CHEMICAL REACTIONS
CYCLIC ACCELERATORS
DECOMPOSITION
DISSOCIATION
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUORIDES
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
INNER-SHELL EXCITATION
MASS SPECTROSCOPY
NSLS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATION SOURCES
RADIATIONS
SILICON COMPOUNDS
SILICON FLUORIDES
SPECTROSCOPY
SYNCHROTRON RADIATION
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
VALENCE