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Librational modes and the structure of ammonium nitrate in its high temperature phases
Authors:Kaj Österlund  Hal J. Rosen
Affiliation:University of Helsinki, Dept. of Basic Instruction in Physics, Helsinki 17, Finland;Lawrence Berkeley Laboratory, Berkeley, California, U.S.A.
Abstract:We have measured the temperature dependence of the low frequency Raman spectrum of ammonium nitrate in its solid phases IV, II and I and also in its melt. Librational modes are observed in phases IV and II but disappear in both phase I and the melt. Our results indicate that the NO3 group is almost freely rotating in the solid phase I.
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