Triplet optical line profiles of orientationally disordered single crystals: 2,3-dimethylnaphthalene and 2,3-dimethylanthracene

✍ Scribed by H. Wachtel; H. Port; H.C. Wolf

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 444 KB
• Volume: 135
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(87)85200-4

✦ Synopsis

The excitonic T, triplet states in single crystals of 2,3dimethylnaphthalene (DMN) and 2,3_dimethylanthracene (DMA) exhibit broadened ( 120 and 1 IO cm-', respectively) asymmetric absorption lines at helium temperature. The corresponding phosphorescence lines are narrower (40 and 50 cm-'), red-shifted and show an inverse asymmetry. The line broadening is attributed to the orientational disorder in DMN and DMA crystals. Based on the concept of dispersive energy transport, a statistical model is used to describe the emission line shift and line shape.