Infrared reflection from the internal mode of crystalline lithium hydroxide

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Abstract
In the lithium hydroxide crystal, the transition moment of the A2u internal mode lies normal to the naturally occurring crystal face, so that the transverse frequency for the mode may not be directly observed in an infrared transmission spectrum. It has been demonstrated previously that under this condition, infrared reflection spectra using transverse magnetic polarization at finite incidence angles show a reflection maximum above the longitudinal frequency. A comparison of theoretically generated reflectivity curves with the experimental spectra reported here yield values for the longitudinal and transverse frequencies. The dipole derivative for the hydroxide stretching mode calculated from these frequencies is in good agreement with previously reported values.

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