Optically detected magnetic-resonance study of triplet-state dynamics in C{sub 70}
- Department of Physics, University of Utah, Salt Lake City, Utah 84112 (United States)
- Ames Laboratory--U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
We present studies of fluorescence, phosphorescence, photoinduced absorption, and their respective optically detected magnetic resonance of C{sub 70} molecules dispersed in polystyrene glasses. Two distinct triplet excitons are identified with principle zero-field splitting parameters ({ital D}{approx_equal}0.0089 and 0.0098 cm{sup {minus}1}, respectively) almost twice those reported in the literature ({ital D}{approx_equal}0.0052 cm{sup {minus}1}). The first triplet is axially symmetric ({ital E}{approx_equal}0) and phosphorescent. Dramatic changes in the line shape and intensity of this triplet are observed as the temperature increases due to a dynamic Jahn-Teller effect. The second triplet, which is believed to arise from strained C{sub 70} molecules, has no axial symmetry ({ital E}{approx_equal}{ital D}/3) and is not phosphorescent. {copyright} {ital 1996 The American Physical Society.}
- DOE Contract Number:
- FG03-93ER45490; W-7405-ENG-82
- OSTI ID:
- 279782
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 12 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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