EFFECTS OF HIGH PRESSURES ON THE PHOSPHORESCENCE OF AROMATIC HYDROCARBONS.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 23, 1967
- Accession Number
- AD0646739
Entities
People
- B. A. Baldwin
- H. W. Offen
Organizations
- University of California, Santa Barbara