Abstract
The sulfate ion internal optic modes in monoclinic lithium sulfate monohydrate (Li2SO4⋅H2O) are studied using a molecular dipole model. The polarization direction of the B symmetry phonons lies in the a–c plane, however a specific direction is not given by symmetry considerations. An analysis of polarized near-normal incidence infrared reflection data complemented by Raman data is sufficient to uniquely determine the polarization of the phonon. In these systems a given A symmetry phonon is ’’paired’’ with a particular B symmetry phonon, that is, both phonons are correlated through the same site group internal mode which in this crystal must be of A symmetry. The correct ’’pairing’’ assignments for several internal modes can be found from an application of the molecular dipole theory to the experimental data.
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