EXCITON AND PHONON FAR-INFRARED SPECTRA OF NAPHTHALENE

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1976

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Ohio State University

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The far-infrared spectrum of naphthalene crystals from 100 to $450 cm^{-1}$ has been investigated. Spectra were taken with resolution down to $1 cm^{-1}$ at temperatures of $78^\circ, 195^\circ K$, and $300^\circ K$ using the Digilab FTS-14 Fourier transform spectrometer. We have looked into the exciton bands of the fundamentals in this region directly, and in other regions indirectly (via hot bands). This is also an ideal region for investigating phonon side bands, and thereby the phonon density-of-states and vibrational exciton-phonon coupling. Comparative Raman spectra were also taken.

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Author Institution: Department of Chemistry, The University of Michigan

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