Fiber-Optic Raman Spectroscopy in Lithium Hydroxide Monohydrate Crystal

The purpose of this research was to register Raman spectra in a lithium hydroxide monohydrate crystal over a wide spectral range at room temperature using fiber-optical spectroscopy. We carried out the registration of Raman spectra at the spectral region 180...1600 cm^-1. The spectral bands obtained were attributed to oscillations races in Raman spectrum of lithium hydroxide monohydrate crystal. In Raman spectra of the crystal we found lattice modes corresponding to translations of lithium ions, hydroxyl groups and water molecules, and to libration of water molecules and hydroxyl groups. As a result, we observed intense Raman lines in the low-frequency region of the spectrum. This opens an opportunity to observe stimulated Raman scattering by lattice modes in these crystals

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