Accession Number : AD0442451

Title :   MULTISTAGE DEACTIVATION IN THE PHOTOLYSIS OF HEXAFLUOROACETONE,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE CHEMISTRY

Personal Author(s) : Strachan,A. N. ; Boyd,R. K. ; Kutschke,K. O.

Report Date : 23 DEC 1963

Pagination or Media Count : 10

Abstract : In principle the vibrationally excited molecular in an upper electronic state, formed by absorption in the ultraviolet region of the spectrum, can attain vibrational equilibrium by two mechanisms. In most discussions of this degradation of vibrational energy it has been considered that the data are represented adequately by a singlestep deactivation from high to low vibrational levels rather than by a multistep cascade from one group of vibrational levels to the next lower group. The present work suggests new treatments of the experimental data by which it is possible to distinguish between the single- and the multistep deactivation processes. It is demonstrated that the literature data on the quantum yield for the decomposition of hexafluoroacetone is better interpreted in terms of a multistep deactivation. Some new data are presented which support this conclusion. (Author)

Descriptors :   (*ACETONES, PHOTOLYSIS), (*FLUORINE COMPOUNDS, ACETONES), (*PHOTOLYSIS, ACETONES), EXCITATION, ULTRAVIOLET RADIATION, PHOTOCHEMICAL REACTIONS, VIBRATION, QUANTUM THEORY, DISSOCIATION, DEGRADATION, HALOGENATED HYDROCARBONS, HYDROCARBONS, GASES, CANADA

Distribution Statement : APPROVED FOR PUBLIC RELEASE