Orientational ordering, site structure, and dynamics for octahedral molecules in low temperature matrices: SF/sub 6/ and SeF/sub 6/ in rare gas solids
From polarization studies of high resolution IR spectra of SF/sub 6/ and SeF/sub 6/ trapped in noble gas solids we show that much of the structure observed for the stretching mode represents site symmetry split components for low symmetry trapping sites, the triply-degenerate ..nu../sub 3/ mode being split into a doubly- and singly-degenerate mode. Most of the sites showing polarization are orientationally ordered with the singly-degenerate component perpendicular to the substrate. We attribute the driving force for ordering to guest--host interaction potentials which result in registry between the molecules and the (111) growth plane during deposition. The observed orientational ordering combined with high temperature annealing studies has allowed the identification of the symmetry of certain trapping sites and further analysis of vibrational dephasing dynamics. Several sites with the same nominal symmetry and structure can be tracked through the matrices discussed herein. The implications of the ordering of impurity structure in a host lattice formed by vapor deposition are discussed.
- Research Organization:
- Los Alamos National Laboratory, University of California, Los Alamos, New Mexico 87545
- OSTI ID:
- 6132795
- Journal Information:
- J. Chem. Phys.; (United States), Vol. 79:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
SELENIUM FLUORIDES
GRAIN ORIENTATION
MATRIX ISOLATION
SULFUR FLUORIDES
DYNAMICS
INFRARED SPECTRA
MOLECULAR STRUCTURE
POLARIZATION
RARE GASES
RESOLUTION
SOLIDS
CRYSTAL STRUCTURE
ELEMENTS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
MECHANICS
MICROSTRUCTURE
NONMETALS
ORIENTATION
SELENIUM COMPOUNDS
SPECTRA
SULFUR COMPOUNDS
360602* - Other Materials- Structure & Phase Studies
656000 - Condensed Matter Physics