TY - JOUR
T1 - LO and TO crystal modes of the hydroxyl stretching vibrations in micro-Raman and infrared spectra of nacrite
AU - Shoval, S.
AU - Yariv, S.
AU - Michaelian, K. H.
AU - Boudeulle, M.
AU - Panczer, G.
PY - 2001
Y1 - 2001
N2 - Three pairs of OH-stretching bands are observed at 3709 and 3701 cm-1, 3653 and 3644 cm-1, and 3628 and 3623 cm-1 in curve-fitted micro-Raman and infrared spectra of nacrite. The pairing is interpreted in terms of longitudinal (LO) and transverse (TO) modes of crystal vibrations and labelled ALO and ATO, CLO and CTO, and DLO and DTO, respectively. The relative intensities of the OH-stretching bands in the polarized micro-Raman spectrum depend strongly on both the orientation of the crystallographic axes and the direction of the electric vector of the laser beam. The inner hydroxyl bands DLO and DTO, which arise from nearly in-plane vibrations, are intense in the c(aa)c, c(bb)c and b(aa)b spectra, in which the incident laser is polarized along the crystallographic a or b axes parallel to the nacrite plates. Due to nearly out-of-plane vibrations, the inner-surface hydroxyl bands CLO and CTO, as well as ALO and ATO are intensified in the b(cc)b spectrum, where the incident laser is polarized along the c axis perpendicular to the nacrite plates.
AB - Three pairs of OH-stretching bands are observed at 3709 and 3701 cm-1, 3653 and 3644 cm-1, and 3628 and 3623 cm-1 in curve-fitted micro-Raman and infrared spectra of nacrite. The pairing is interpreted in terms of longitudinal (LO) and transverse (TO) modes of crystal vibrations and labelled ALO and ATO, CLO and CTO, and DLO and DTO, respectively. The relative intensities of the OH-stretching bands in the polarized micro-Raman spectrum depend strongly on both the orientation of the crystallographic axes and the direction of the electric vector of the laser beam. The inner hydroxyl bands DLO and DTO, which arise from nearly in-plane vibrations, are intense in the c(aa)c, c(bb)c and b(aa)b spectra, in which the incident laser is polarized along the crystallographic a or b axes parallel to the nacrite plates. Due to nearly out-of-plane vibrations, the inner-surface hydroxyl bands CLO and CTO, as well as ALO and ATO are intensified in the b(cc)b spectrum, where the incident laser is polarized along the c axis perpendicular to the nacrite plates.
UR - http://www.scopus.com/inward/record.url?scp=0034825203&partnerID=8YFLogxK
U2 - 10.1016/S0925-3467(00)00091-4
DO - 10.1016/S0925-3467(00)00091-4
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AN - SCOPUS:0034825203
SN - 0925-3467
VL - 16
SP - 311
EP - 318
JO - Optical Materials
JF - Optical Materials
IS - 1-2
ER -