Microwave Emission of the 211?212 Rotational Transition in Interstellar Acetaldehyde

Abstract

The 211?212 transition of acetaldehyde at 3195 ·167 MHz has been observed in emission in SgrB2 with the Parkes 64 m telescope. Comparison of the intensities of the 110---> 11 and 211--->212 emission lines suggests that both transitions may be inverted.