Linear wave vector dependence of low-frequency Raman modes in two uniaxial gyrotropic quartz-type materials: α-GaPO4 and α-AlPO4

Autor:	R. Ouillon, J.-P. Pinan-Lucarre, P. Ranson
Rok vydání:	1999
Předmět:	Physics symbols.namesake Condensed matter physics Spatial dispersion Degenerate energy levels symbols General Physics and Astronomy Wave vector Physical and Theoretical Chemistry Low frequency Type (model theory) Raman spectroscopy Quartz
Zdroj:	Chemical Physics Letters. 302:164-170
ISSN:	0009-2614
DOI:	10.1016/s0009-2614(99)00091-3
Popis:	Linear wave vector dependence of low-frequency E modes was investigated in two quartz-type materials: α-GaPO4 and α-AlPO4. It was found that the splitting of doubly degenerate optical E-modes caused by spatial dispersion is similar to that previously measured for the 132 cm−1 E-mode in α-quartz by Pine and Dresselhaus. Somewhat surprisingly, spatial dispersion does not occur for all E-modes studied. This behaviour is discussed in terms of the different origin of these modes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::595fcc21a4673247fc61fa9184652c92 https://doi.org/10.1016/s0009-2614(99)00091-3 Zobrazit plný text záznamu Full Text from ScienceDirect