Dynamics for CH/sub 3/F and CD/sub 3/F isolated in rare gas solids
High resolution infrared spectra have been obtained for CH/sub 3/F and CD/sub 3/F in argon and krypton matrices from 3 to 39 K. Low-temperature spectra show structure indicative of two stable monomer sites. As temperature is raised, the structure collapses to give symmetric peaks for each mode. The line shapes and their broadening with temperature show large dependence on the modes, isotope, and host matrix. On the basis of the absence of rovibrational structure and the very different line shapes for the various modes, we conclude that free or hindered rotation does not contribute to the absorption lines of methyl fluoride in argon or krypton matrices below 40 K. The mode dependent line broadening with increasing temperatures has been attributed to vibrational dephasing involving low energy site local phonon modes. Implications with regard to vibrational energy relaxation, which is currently thought to be dominated by a vibration to rotation energy transfer, are discussed.
- Research Organization:
- Los Alamos National Laboratory, University of California, Los Alamos, New Mexico 87545
- OSTI ID:
- 5624436
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 76:4; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN COMPOUNDS
INFRARED SPECTRA
KRYPTON
LINE BROADENING
LINE WIDTHS
MATRIX ISOLATION
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RARE GASES
RELAXATION
SPECTRA
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
VIBRATIONAL STATES