Accession Number : AD0430510

Title :   THE KINETICS OF EXCIMER FORMATION IN FLUID MEDIA.

Descriptive Note : Final technical rept., 1 Dec 62-30 Nov 63,

Corporate Author : SHEFFIELD UNIV (ENGLAND)

Personal Author(s) : Stevens,Brian ; Ban,Miklos I. ; Walker,Michael S.

Report Date : 30 NOV 1963

Pagination or Media Count : 50

Abstract : The ratio of molecular to excimer fluorescence intensities has been measured as a function of temperature for concentrated solutions of 2-methylnaphthalene, 1-fluoronaphthalene, acenaphthene and 1,2-benzanthracene in low-viscosity solvents. Values of 5-6 kcal/mole obtained for the heats of photoassociation are significantly lower than that of 11 kcal/mole found for pyrene, and indicate that the repulsion energy between unexcited molecules in the excimer configuration is largely responsible for the red-shift of some 6000cm-1 to the-1 power of the excimer band with respect to the molecular spectrum. The corresponding entropies of photoassociation are estimated to lie within the range of -20 to -28 e.u.. (Author)

Descriptors :   (*FLUORESCENCE, FLUIDS), FLUORINE COMPOUNDS, DYNAMICS, EXCITATION, AROMATIC COMPOUNDS, ENTROPY, ENTHALPY, ENERGY, PHOSPHORESCENCE, HYDROCARBONS, POLYCYCLIC COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE