The infrared. ~pectra of both solid and gaseous BHaCO, lOBHaCO, BDaCO, and lOBDaCO have been obtamed. In addition so~e observations ~ave been made on the Raman spectra of the gaseous compounds. Fw:damental frequencies have bee? assigned to all normal modes and the vibrational potential constants for bonne carbonyl have been approximated by means of a simplified force field.