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The phonon spectrum of molecular crystals from exciton sidebands

✍ Scribed by P.A. Reynolds

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
344 KB
Volume
22
Category
Article
ISSN
0009-2614

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✦ Synopsis

The phonon sidebands on the cscitons observed in certain molecular cryslals may be repres--nted by a ~e@tcd density of states. 11 is here shown qualjtatively and by reference to typical experiments that this function does not, in general, resemble the true density of state: b,Jt often may be predicted from data on the Brillouin zone centre translarional modes.

πŸ“œ SIMILAR VOLUMES

Comment: phonon spectrum of molecular cr
Comment: phonon spectrum of molecular crystals from exciton sidebands
✍ R. Kopelman; F.W. Ochs; P.N. Prasad πŸ“‚ Article πŸ“… 1974 πŸ› Elsevier Science 🌐 English βš– 404 KB

Phonon sidebands of excitons in molecular crystals with n&igii~~ sma3 excitation exchjlge intern&ions, inchiding isotopic guest systems, are not, in genera& expected to be pre~o~~t1~ weighted by translatbnal modes that are predictable from iM.louin zoine centre (q = 0) ones. Sdme phonon sideband dat

Effect of the exciton bandwidth on elect
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A principle describing the effect of exciton bandwidths on the intensity of phonon sidebands in electronic spectra of molecular crystals is derived from some experimental observations, from some simple arguments, and from l &e quantum theory of electron-phonon coupling.

Experimental determination of the triple
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An experimental method involving the temperature dependence of the intensity of trap emission is employed to determine the sign and magnitude of the nearest-neighbor intermolecular interaction matrix element responsible for triplet exciton transport and the number of wave vector states comprising th