THE ROTATIONAL SPECTRUM AND MOLECULAR-PROPERTIES OF BROMINE DIOXIDE, OBRO

The rotational spectrum of the OBrO radical has been observed in the g as phase over the solid products of the O+Br-2 reaction. Spectra have been measured for both (OBrO)-Br-79 and (OBrO)-Br-81 in their (000), ( 010), and (020) vibrational states in selected regions between 88 and 627 GHz spanning the quantum numbers 1 less than or equal to N less th an or equal to 61 and 0 less than or equal to K-a less than or equal t o 14. The spectra are well described by a Hamiltonian which includes c entrifugal distortion effects for fine and hyperfine terms. The molecu lar structure, the dipole moment, and the harmonic force field have be en derived, and they, as well as fine and hyperfine structure constant s, are compared with data of related molecules and electron spin reson ance data from OBrO isolated in cryogenic salt matrices. (C) 1997 Amer ican Institute of Physics. [S0021-9606(97)01544-4].