In:
MRS Proceedings, Springer Science and Business Media LLC, Vol. 131 ( 1988)
Abstract:
Studies of the unimolecular decay, following the excitation of core electrons of the carbon and fluorine atoms in carbon tetrafluoride and silicon and fluorine in silicon tetrafluoride by monochromatic, synchrotron radiation, provided evidence for a “valence bond depopulation” fragmentation mechanism. 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 2+ ions in the time-of-flight mass spectra following excitation of a fluorine is electron in SiF 4 is significant because it provides direct evidence for the formation of a localized, two-hole, final valence state that persists on the time scale of fragmentation. In contrast, the lack of F 2+ ions from CF 4 , indicates that the fragmentation occurs through a delocalized two-hole state.
Type of Medium:
Online Resource
ISSN:
0272-9172
,
1946-4274
DOI:
10.1557/PROC-131-523
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
1988
