Temperature dependence of the Raman spectrum of ammonia solid I

摘要

The Raman spectrum of ammonia solid I in the lattice and intramolecular regions has been studied at temperatures between 93.6 and 213.5 K. The three most intense lines in the lattice region, one librational and two translational modes, have frequencies and linewidths whose temperature dependence can be explained by anharmonic interactions. In the intramolecular region, all bending modes studied have unusually large decreases in frequency with temperature. However, there is no indication in support of the recently reported criticalhyphen;like behavior of the compressibility near the melting line.