Study of the Low-Frequency OH− Motions of LiOH by Neutron Inelastic Scattering

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Abstract
Low‐frequency OH− motions in polycrystalline LiOH have been studied in the range 900 to 8 cm−1 by inelastic neutron scattering at temperatures of 220°, 293°, 360°, and 412°K. This experiment contrasts the models proposed by Hexter and Wickersheim to explain the infrared sideband splitting in LiOH. The experimental data show the following: (1) The infrared sidebands of 152 and 135 cm−1 must be associated with an acoustic mode with a cutoff near 138 cm−1; (2) the sideband of 95 cm−1 may be associated with a possible acoustic mode with a cutoff in the range 85 to 100 cm−1; (3) optical modes are observed at 625, 468, and 332 cm−1; (4) an exact description of the OH− motions associated with each mode is not yet available. Further, the present data are difficult to correlate with a highly localized rotational model.

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