Accession Number : AD0646739
Title : EFFECTS OF HIGH PRESSURES ON THE PHOSPHORESCENCE OF AROMATIC HYDROCARBONS.
Descriptive Note : Technical rept.,
Corporate Author : CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY
Personal Author(s) : Baldwin,B. A. ; Offen,H. W.
Report Date : 23 JAN 1967
Pagination or Media Count : 30
Abstract : The phosphorescence spectra, intensities and lifetimes were measured for ten aromatic hydrocarbons, dispersed in polymethylmethacrylate, in the 0-32 kbar pressure range at 298K. It was observed that the red shift is small (200-450/cm at 32 kbar) and comparable to the red shift observed in fluorescence. The measured phosphorescence lifetime decreases montonically with increasing pressures over the 0-32 kbar range for nine of the ten aromatics. From dynamic intensity measurements at 0, 10, and 20 kbar pressure it is concluded that the natural lifetime decreases by about 30% at 20 kbar. Also, the radiationless rate constant must increase by roughly the same amount. It is concluded that pressure enhances spin-orbit interaction and the vibrational overlap factors. (Author)
Descriptors : (*HYDROCARBONS, *PHOSPHORESCENCE), AROMATIC COMPOUNDS, HIGH PRESSURE, SPECTROSCOPY
Subject Categories : Organic Chemistry
Atomic and Molecular Physics and Spectroscopy
Distribution Statement : APPROVED FOR PUBLIC RELEASE