Raman spectrum of ammonia solid II.

Raman spectra of the orientationally disordered phase II of solid ammonia in the intramolecular and lattice regions are reported for the first time. The spectrum of the intramolecular region contains one line for each vibrational mode, broadened by the orientational disorder. The lattice region contains two broad lines near 50 and 280 cm-1, assigned to translational modes, and two central peaks ascribed to rotational relaxation. [ABSTRACT FROM AUTHOR]