INFRARED AND MICROWAVE SPECTER AND FORCE-FIELD OF DBO - THE CORIOLIS INTERACTION BETWEEN THE NU(1) AND NU(2)+NU(3) STATES

The upsilon(1) and upsilon(3) bands of (DBO)-B-11 and the upsilon(1) b and of (DBO)-B-10 were observed by using an infrared diode laser spect rometer. The DBO molecule was generated by an sc discharge in a mixtur e of BCl3, D-2, O-2, and He. As inferred previously, a strong Coriolis interaction was in fact found to take place between the upsilon(1) an d upsilon(2) + upsilon(3) states, and an analysis of the observed upsi lon(1) spectra, which explicitly took into account this Coriolis inter action, predicted the pure rotational transition frequencies of DBO in the upsilon(1) state. Pure rotational lines were then detected by mic rowave spectroscopy, confirming the validity of the infrared assignmen t. In the microwave experiment DBO molecules were generated by a disch arge in a mixture of B2D6 and O-2. The three fundamental bands and a h oc band of (DBO)-B-11, as well as the upsilon(1) and upsilon(3) bands of (DBO)-B-10, were subsequently recorded in emission with a Fourier t ransform infrared spectrometer. DBO molecules were generated by the re action of D-2 with HBO at temperatures above 800 degrees C in a cerami c tube furnace. All of the observed spectra were simultaneously subjec ted to a least-squares analysis to obtain molecular parameters in the ground, upsilon(1), upsilon(2), upsilon(3), and upsilon(2) + upsilon(3 ) states. The results thus obtained improved the force field and molec ular structure of the HBO/DBO molecules reported in a previous study ( Y. Kawashima, Y. Endo, and E. Hirota, 1989, J. Mol. Spectrosc. 133, 11 6-127). (C) 1998 Academic Press.