Dynamics of crystalline N-methylacetamide: temperature dependence of infrared and inelastic neutron scattering spectra

A study was conducted to analyze the properties of crystalline N-methylacetamide (NMA). The spectra of the isotopic derivatives of NMA were obtained at six temperatures in the range 20-150 K using a filter difference spectrometer. Experimental results indicated that the temperature dependence of the intensities of the librations of the methyl groups in NMA supported no indication for a possible methyl-methyl coupling.