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The source of excess linewidth in EPR of triplet excitons in molecular crystals

โœ Scribed by J. Rosenthal; L. Yarmus; N.F. Berk; W. Bizzaro

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
357 KB
Volume
56
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

It is shown that the EPR linewidth spectrum of triplet excitons in molecular crystabs can be severely distorted by weak orientational disorder. The demonstration employs a one-parameter correction procedure based ou the assumption that the angular dependence of excess width is directly'proportional to the angular gradient of the resonant field Application to the discrepant data of I-barer and Wolf brings them into agreement with theory and with more recent experiments. A phenome nologieal model of the disorder is used to interpret the distortion parameter. These results suggest the potential vabre of exciton EPR as a probe of structural imperfections in molecular crystals.

๐Ÿ“œ SIMILAR VOLUMES

The observation of coherent triplet exci
The observation of coherent triplet excitons and density of states functions in molecular crystals
โœ A.H. Francis; C.B. Harris ๐Ÿ“‚ Article ๐Ÿ“… 1971 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 568 KB

The observation of coherent triplet Frenkel excitons is reported in a molecular crystal 1,2,4.5 tetrachlorobenzene. The results can be interpreted in terms of a one-dimensional model in which the largest intermolecular exchange interaction is associated with the translationally equivalent molecules