Isotopic mixed crystal exciton spectra in the far infrared: Naphthalene |
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Authors: | DC Ahlgren R Kopelman |
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Institution: | Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA |
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Abstract: | The far infrared vibrational exciton spectra of isotopic mixed crystals of naphthalene-h8 and d8 were studied. The two observed translational phonon modes were determined to fall into the amalgamated band limit while the lowest energy B3u, Au and B1u vibrational exciton bands were found to be in the separated band limit. The lowest energy B3u “butterfly” mode with its large (15 cm?1) exciton splitting was found to agree well with CPA calculations of mixed crystal spectra. A peak at 185 cm?1 was also assigned as a peak in the vibrational exciton density-of-states of the B3u mode. |
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