High temperature exchange and linewidth anisotropy in an ion-radical salt of TCNQ

The EPR linewidth of triphenylmethylarsonium (TCNQ)2 was measured as a function of crystal orientation at room temperature. The anisotropy is reproduced by calculating the static dipole–dipole interaction in the dense triplet exciton system and including the modulation by the exchange coupling betwe...

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Bibliographic Details
Published in:The Journal of chemical physics 1986-02, Vol.84 (4), p.2356-2360
Main Authors: BONDESON, S. R, HOLMAN, R. W
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron paramagnetic resonance and relaxation
Exact sciences and technology
Free radicals
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Physics
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Summary:The EPR linewidth of triphenylmethylarsonium (TCNQ)2 was measured as a function of crystal orientation at room temperature. The anisotropy is reproduced by calculating the static dipole–dipole interaction in the dense triplet exciton system and including the modulation by the exchange coupling between excitons. The exchange frequency is found to be ωe=6.7×109 s−1. A discussion of the effects of adsorbed molecular oxygen is also included.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.450349