Reassignment of the Vibrational Spectrum of Benzimidazole

New spectroscopic data on benzimidazole and benzimidazole- d 2, using inelastic neutron scattering spectroscopy, has revealed previously unobserved bands. These new observations are incorporated into a complete assignment of the benzimidazole spectrum and shown to agree well with ab initio calculations on the system. The new assignment scheme eigenvectors have been correlated to those of indole.