33SO2: Interstellar Identification and Laboratory Measurements.

The rotational spectrum of 33S isotopically substituted sulfur dioxide, 33SO2, has been measured up to nearly 1 THz. The combined analysis of these new data together with the published line frequencies resulted in refined molecular constants, such as the rotational (A = 59856.4723(62) MHz, B = 10318.3012(15) MHz, C = 8780.1363(15) MHz) and centrifugal distortion constants which yielded precise frequency predictions. The carrier of six previously unidentified interstellar lines in the Caltech molecular line survey in the 325-360 GHz band could be assigned to 33SO2. Copyright 1997 Academic Press. Copyright 1997Academic Press