Vibronic excitons in crystalline anthracene
β Scribed by Roberto E. Lagos; Richard A. Friesner
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 53 KB
- Volume
- 31-32
- Category
- Article
- ISSN
- 0022-2313
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π SIMILAR VOLUMES
The phosphorescence and delayed fluorescence associated with triplet exciton trapping in crystalline anthracene have been used to demonstrate the physical nature of many of the traps and to determine their depth.
Changes in spectral frequencies and intensities recorded at low temperatures (4 to 40 K), as well as measurements of prompt-fluorescence lifetimes, of annealed and deformed high-purity single crystals of anthracene reveal that traps l013ed nt ca. 300 cm-' and 1500 cm-' below the Sr level may be ascr
The energy and intensity of esciton transitions with k parallel to the UJlO! direction have been cnlculoled using boson theory and intermolecular interactions obtained by resxling the lattice sums of Silbcy, Jortner and Rice. Compclrison with the reflecrion espcrimznts of Koch and Otto shows substmt