1. The t1 absorption and phosphorescence spectra of α-phase and γ-phase p-dichlorobenzene crystals
- Author
-
Steven D. Colson, David B. Hellmann, and Bruce W. Gash
- Subjects
Dichlorobenzene ,Extended X-ray absorption fine structure ,Absorption spectroscopy ,Chemistry ,Analytical chemistry ,General Physics and Astronomy ,Emission spectrum ,Physical and Theoretical Chemistry ,Ground state ,Phosphorescence ,Excitation ,Spectral line - Abstract
The T 1 absorption and emission spectra of the recently discovered α-phase of p -dichlorobenzene are presented and analyzed. New high resolution spectra of the α-phase are also reported and the analysis of the T 1 absorption spectrum is revised in light of results for the γ-phase. The frequency of the b 2g mode, involving out-of-plane chlorine motions, is found to drop by 210 cm −1 upon excitation and, as a result, it is active as a progression-forming mode in both the absorption and emission spectra. Its activity, relative :othe a g modes, is quite different in the two phases of p -dichlorobenzene and is not the same in the absorption and emission spectra. The high resolution phosphorescence spectrum of the α-phase shows detailed fine structure due to both multiple site emission and to splittings of some of the ground state vibrational levels.
- Published
- 1973
- Full Text
- View/download PDF