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The EPR linewidth of triplet excitons in single‐crystal anthracene: A re‐examination
Author(s) -
Bizzaro W.,
Rosenthal J.,
Berk N. F.,
Yarmus L.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220840104
Subject(s) - anthracene , laser linewidth , exciton , electron paramagnetic resonance , crystal (programming language) , condensed matter physics , relaxation (psychology) , spin (aerodynamics) , materials science , single crystal , molecular physics , chemistry , nuclear magnetic resonance , physics , photochemistry , crystallography , optics , thermodynamics , psychology , social psychology , laser , computer science , programming language
The magnetic resonance linewidths of triplet excitions in single‐crystal anthracene are measured in room temperature experiments performed at 24 GHz. The motivations for this study are the recent appearance of Reineker's linewidth theory, which is based on an extension of the Haken‐Strobl model of exciton transport, and the inability of this theory to account satisfactorily for earlier published results on anthracene. The data presented here, which differ distinctly from the previous work, are fit in both magnitude and angular dependence by the theory. This supports the theoretical assumption that hopping between differently oriented molecules in the unit cell is the dominant spin relaxation mechanism for triplet excitons in molecular crystals similar to anthracene.