An EPR study of the triplet state of pentacene by electron spin-echo techniques and laser flash excitation
β Scribed by A.J. Van Strien; J. Schmidt
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 422 KB
- Volume
- 70
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
By combmmg
the electron spmecho technique with pulsed-laser eYcltatlon we have been able to perform an EPR study of the very short-hved (z 30 11s) trlplet state of pentacene m naphthalene.
We have obtamed the onentation of the pentacene molecule in the naphthalene host crystal, the zero-field sphttmg parameters, and the kmetlc properties of the triplet spm IeveIs.
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The photoexcitcd triplet states of chlorophyll a and b are studied by the EPR method at -85 K using modulated ii&t excitation. Both compounds show anomalous EPR line intensities and transient kinetics, indicating e!ectron spin polxi~ation (ESP) in the photoexcitcd triplet state. EPR studies, using h
We have observed a temperature dependence of the phase memory time TM in the lowest triplet state of the pair of two translationally equivalent naphthalene-lzg guest molecules in a naphthalenoda host crustal in zero magnetic field. From this experiment we obtain the energy separation between the two