Debye-Waller factors in incoherent inelastic neutron scattering spectra of molecular polycrystals

The incoherent inelastic neutron scattering (IINS) spectrum of HCCo3(CO)9 has been obtained in order to test some present methods of calculating band intensities for polycrystalline samples. The fundamental and first overtones of the carbon-hydrogen bending mode were observed at 860 and 1712 cm-1 respectively. The C-H stretching mode was observed at 3041 cm-1 and this is the first report of the observation of such a mode in which there is no possibility of confusion with overtone and combination bands.