The J = 5/2 3/2 transition of the
lower energy fine structure component 2Π3/2
of the sulfanyl radical SH has been detected in absorption in the
diffuse medium along the sight-line to the submillimeter continuum
source W49N by
D. A. Neufeld, E. Falgarone, M. Gerin, B. Godard, E. Herbst, G. Pineau des ForÍts, A. I. Vasyunin, R. GŁsten, H. Wiesemeyer, and O. Ricken,
Discovery of Interstellar Mercapto Radicals (SH) with the GREAT Instrument on SOFIA
Astron. Astrophys. 542, (2012), Art. No. L6.
Two lines were observed near 1382.91 and 1383.24 GHz because of the Λ-doubling. The inferred column density is very similar to that of SH+ in that source, differing by less than a factor of two.
D. A. Neufeld, B. Godard, M. Gerin, G. Pineau des ForÍts, C. Bernier,
E. Falgarone, U. U. Graf, R. GŁsten, E. Herbst, P. Lesaffre, P. Schilke,
P. Sonnentrucker, and H. Wiesemeyer
Sulphur-bearing molecules in diffuse molecular clouds: new results from SOFIA/GREAT and the IRAM 30 m telescope
Astron. Astrophys. 577, (2015), Art. No. A49.
The same transitions of SH as above were observed toward W31C, G29.96-0.02, G34.3+0.1, W51, and W49N again.