RAMAN SPECTRUM OF CRYSTALLINE BENZENE.

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1966

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Ohio State University

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Infrared spectra and electronic emission spectra are both useful in the study of vibrational exciton splittings in organic crystals. Raman spectroscopy, up to now, has had limited usefulness in such studies. In benzene, with four molecules per unit cell, each vibration band is expected to be split into four components (eight for an E vibration). In Raman active vibrations, all four components (eight for an E vibration) are Raman active, while in infrared active vibrations only 3 components (six for an E vibration) are seen in the infrared. Previous Raman data show no exciton splittings. This is probably due to poor resolution and low intensity. An argon ion laser is being used to investigate Raman spectra and polarization ratios of organic crystals at low temperature under high resolution. Data are presented for benzene $(C_{6}H_{6})$ and perdeuterated benzene $(C_{6}D_{6})$ at $77^{\circ} K$ and $4.2^{\circ} K$.

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Author Institution: California Institute of Technology

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