Polarized Raman spectrum and normal coordinate analysis of α‐MnMoO4

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Abstract
The poarized Raman spectum of α‐MnMoO4 and the infrared spectrum of the poycrystalline material are reported. The observed bands were assigned on the basis of a normal coordinate analysis using a valences force field. Force constants of molybdate ions were examined in detail. Lattic vibrations are explained mainly in terms of MnO streching force constants. Coupling between MoO stretchings on MoO bonds of differents lengths is slight and in general a v2‐like mode is higher in frequesncy than a v4‐like mode. The position of oxygen atoms substituted after an oxidation reaction of an olefin by using an 18O tracer is identified.
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