“…Infrared 23–26, 28, 30–34, far infrared 24, 26, 29, 31, Raman 27, and inelastic neutron scattering experiments 29, 31 have been carried out on acetonitrile trapped in argon 23, 24, 26, 27, 29–31, 33, krypton 26, 27, xenon 26, and nitrogen 24, 28, 30 matrices. Most of the data have been interpreted in terms of the presence of a dimer of C 2h symmetry, although the centrosymmetric nature of the dimer was challenged by Pacansky and Coufal 25, and Dessent et al presented some evidence in support of a collinear species 35.…”