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Raman Phonon Spectra of Isotopic Mixed Naphthalene Crystals: Librational Exciton Model and the Amalgamation Limit

dc.contributor.authorPrasad, Paras N.en_US
dc.contributor.authorKopelman, Raoulen_US
dc.date.accessioned2010-05-06T22:01:59Z
dc.date.available2010-05-06T22:01:59Z
dc.date.issued1972-07-15en_US
dc.identifier.citationPrasad, Paras N.; Kopelman, Raoul (1972). "Raman Phonon Spectra of Isotopic Mixed Naphthalene Crystals: Librational Exciton Model and the Amalgamation Limit." The Journal of Chemical Physics 57(2): 863-865. <http://hdl.handle.net/2027.42/70356>en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/70356
dc.description.abstractWe present an experimental Raman study of lattice modes in neat and mixed (10%–90%) crystals of naphthalene‐h8 and naphthalene‐d8 at 100°K with 1 cm−1 resolution. The spectral features of the neat crystals are preserved in the heavily doped mixed crystals, with small shifts and broadenings characteristic of an amalgamation limit that assumes weakly coupled excitation bands in the restricted Frenkel‐Davydov limit. Rotation‐translation interaction does not affect the mixed crystal spectra, thus making the Raman technique uniquely suited for the investigation of the librational (rotational) phonon band structure. The evidence is against localized or pseudolocalized phonons in these isotopic mixed crystals.en_US
dc.format.extent3102 bytes
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dc.format.mimetypeapplication/pdf
dc.publisherThe American Institute of Physicsen_US
dc.rights© The American Institute of Physicsen_US
dc.titleRaman Phonon Spectra of Isotopic Mixed Naphthalene Crystals: Librational Exciton Model and the Amalgamation Limiten_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelPhysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Chemistry, The University of Michigan, Ann Arbor, Michigan 48104en_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/70356/2/JCPSA6-57-2-863-1.pdf
dc.identifier.doi10.1063/1.1678330en_US
dc.identifier.sourceThe Journal of Chemical Physicsen_US
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dc.identifier.citedreferenceOur naphthalene‐d8naphthalene‐d8 does not show a band at about 160 cm−1160cm−1 (not even at room temperature), in contrast to that reported by A. Bree and R. A. Kydd, Spectrochim. Acta 26a, 1791 (1970).We do, sometimes, see some weak bands at about 40 cm−140cm−1 in both neat and mixed crystals. These, we feel, are related to the pure crystal phonon density‐of‐states peaks and will be discussed further in the future. [R. Kopelman, F. W. Ochs and P. N. Prasad, (unpublished).]en_US
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dc.identifier.citedreferenceIn contrast to some suggestions by D. M. Hanson, J. Chem. Phys. 51, 5063 (1969).We feel now that these data should be interpreted in terms of the host phonon density‐of‐states peaks [R. Kopelman, F. W. Ochs and P. N. Prasad, (unpublished)], in agreement with the present views of D. M. Hanson (private communication). Compare also G. Dolling and B. M. Powell, Proc. Roy. Soc. (London) A319, 209 (1970).en_US
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dc.owningcollnamePhysics, Department of


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