Structure, hydrogen bonding and thermal expansion of ammonium carbonate monohydrate

Figure 9 from

Fortes, A. D., I. G. Wood, D. Alfé, E. R. Hernàndez, M. J. Gutmann, & H. A. Sparkes (2014): Structure, hydrogen bonding and thermal expansion of ammonium carbonate monohydrate Acta Crystallographica B 70(6), 948-962 (doi:10.1107/S205252061402126X)

Raman spectra of ammonium carbonate monohydrate collected at 263 K (bottom), 195 K (middle) and 80 K (top). DFT-calculated Raman-active zone-centre phonon frequencies of various symmetries (Ag, B1g, B2g and B3g) are shown by vertical tick marks beneath the spectra. Broad identifications of the normal modes and combinations responsible for the observed bands are labelled.