Infrared and polarized single crystal Raman spectra of lithium triborate (LBO; LiB3O5) are reported and analysed. All four (A1, A2, B1 and B2) symmetry species of the C2v, point group isomorphic to the C2v9(Pna21) space group are Raman active in distinct crystal polarization experiments. A complete set of symmetry assignments based on a factor group analysis is presented. The internal and external vibrations are separated on the basis of frequency and the observation that the magnitude of the correlation splitting for the internal modes is very small. A comparison of the internal frequencies of various borate species suggests a correlation between the B-O stretching frequency and the nonlinear optical efficiency of the material.
|Original language||English (US)|
|Number of pages||8|
|Journal||Spectrochimica Acta Part A: Molecular Spectroscopy|
|State||Published - 1991|
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