
%0 Journal Article
%A Sinclair, MW 
%A Fourikis, N 
%A Ribes, JC 
%A Robinson, BJ 
%A Brown, RD 
%A Godfrey, PD 
%T Detection of Interstellar Thioformaldehyde
%J Australian Journal of Physics
%D 1973/02/01
%V 26
%N 1
%P 85-92
%K 
%R https://doi.org/10.1071/PH730085
%U https://www.publish.csiro.au/paper/PH730085 
%X The 211 +-212 transition of thioformaldehyde (HCHS) has been observed in absorption in the direction of SagittariusB2. For a rest frequency of 3139· 38 MHz the peak absorption occurs at a radial velocity of 60 ± 4 km s -1. The half-width of the absorption profile is equivalent to 20 kms-1 and the column density of HCHS is greater than 1016 molecules cm - 2. Comparison with the 211 +-212 absorption of formaldehyde (HCHO) at 15 GHz allows the relative abundance of the two molecular species to be computed as a function of the rotational excitation temperature. For thermal equilibrium the strength of the 110-111 absorption in SgrB2 by thioformaldehyde predicted from the 211+-212 HCHS observations is considerably greater than the limits set by a number of observers for the 110-111 transition at 1046 MHz. 
