Vibrational relaxation of highly excited SiF sub 4 and C sub 6 F sub 5 H by Ar

Journal Article · Tue May 15 04:00:00 EDT 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.458372· OSTI ID:7151608

Beck, K M; Gordon, R J ^[1]

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1. Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60680 (USA)

The vibrational relaxation of SiF{sub 4} and C{sub 6}F{sub 5}H in an Ar bath was measured as a function of initial energy using the method of time-resolved optoacoustics. SiF{sub 4} was found to relax nonexponentially, with a rate constant which varied approximately as the vibrational energy raised to the 3/2 power. This behavior is similar to that observed earlier for SF{sub 6}+Ar below the bottleneck. In contrast, C{sub 6}F{sub 5}H was observed to decay exponentially, as expected for a large molecule in the quasicontinuum. These two types of behavior are discussed in the context of previously proposed propensity rules for the vibrational relaxation of highly excited molecules.

• DOE Contract Number: FG02-88ER13827
• OSTI ID: 7151608
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 92:10; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ARGON
AROMATICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
FLUIDS
FLUORIDES
FLUORINATED AROMATIC HYDROCARBONS
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
HALOGENATED AROMATIC HYDROCARBONS
MOLECULE COLLISIONS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RARE GASES
RELAXATION
SILICON COMPOUNDS
SILICON FLUORIDES
VIBRATIONAL STATES