Abstract
We report a detailed experimental study of infrared reactivity and Raman spectroscopies in strongly deuterated betaine arsenate: BA 0.08 DBA 0.92 . The temperature dependence of the frequency of the hydrogen bonds stretching modes shows a different critical behaviour for the different types of hydrogen bonds. At 163 K , there is evidence for the proton ordering in the shorter hydrogen bond. A progressive softening of the dynamical central peak revelead some aspects of an order-disorder mechanism.
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