Bromineoxides have been generated by passing a mixture of Br(2)/O(2)/Ar through a microwave discharge. The products were stabilized at 6.5 K in an excess amount of argon. Infrared spectroscopy was used to analyze the species formed; experiments with enriched (18)O(2) and abinitio calculations were carried out to assist in the assignment of the spectra. Besides the known species BrO, OBrO, and BrBrO