dc.creator Scott, J. F. en_US dc.creator Cheesman, L. E. en_US dc.creator Porto, S. P. S. en_US dc.date.accessioned 2006-06-15T16:39:24Z dc.date.available 2006-06-15T16:39:24Z dc.date.issued 1967 en_US dc.identifier 1967-N-8 en_US dc.identifier.uri http://hdl.handle.net/1811/15294 dc.description Author Institution: Bell Telephone Laboratories Incorporated, Murray Hill en_US dc.description.abstract Mixed electromagnetic-mechanical excitations known as polaritons'' are observed in Raman forward-scattering experiments on $\alpha$-quartz using an argon laser. Dispersion relations of the polariton frequencies are extended from the case of simple diatomic lattices to a more complex system, namely, $\alpha$-quartz, which has nine atoms per unit cell. The depedence of frequency upon scattering angle observed for these mixed excitations in quartz is shown to be in very good agreement with that predicted. Polaritons associated with the transverse phonons at 1072, 797 and $450 cm^{-1}$ in $\alpha$-quartz are discussed in the present work. The polariton associated with the $1072 cm^{-1}$ phonon mode is observed to range in frequency from 1072 to $833 cm^{-1}$; the polariton associated with the $797 cm^{-1}$ phonon mode is observed at frequencies from 797 to $700 cm^{-1}$; and that associated with the $450 cm^{-1}$ phonon mode is observed from 450 to $407 cm^{-1}$. en_US dc.format.extent 134940 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title POLARITON SPECTRUM OF $\alpha$-QUARTZ. en_US dc.type article en_US
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