Table 2
Spectroscopic information of the selected Ka = 0 and 1 transitions of HOCS+ detected towards G+0.693−0.027 (shown in Fig. A.1).
| Frequency | Transition(a) | log I | ɡu | Eup | Blending |
|---|---|---|---|---|---|
| (GHz) | (nm2 MHz) | (K) | |||
| 34.3598431* | 30,3 − 20,2 | −5.0117 | 7 | 3.3 | HNC34S |
| 45.8129972* | 40,4 − 30,3 | −4.6397 | 9 | 5.5 | HNC34S |
| 80.1716982* | 70,7 − 60,6 | −3.9237 | 15 | 15.3 | HNC34S and t−C2H3CHO |
| 91.6242541* | 80,8 −70,7 | −3.7557 | 17 | 19.7 | HNC34S |
| 103.0765925* | 90,9 − 80,8 | −3.6090 | 19 | 24.6 | HNC34S and N−CH3NHCHO |
| 114.5286862* | 100,10 −90,9 | −3.4793 | 21 | 30.0 | HNC34S |
| 125.9805079* | 110,11 − 100,10 | −3.3635 | 23 | 36.0 | HNC34S and H13CONH2 |
| 137.4320305* | 120,12 − 110,11 | −3.2593 | 25 | 42.6 | HNC34S |
| 148.8832268* | 130,13 −120,12 | −3.1649 | 27 | 49.7 | HNC34S and HCOCH2OH |
| 160.3340697* | 140,14 −130,13 | −3.0791 | 29 | 57.3 | HNC34S and Z−CH3CHNH |
| 34.4294313 | 31,2 −21,1 | −5.1147 | 7 | 40.1 | Unblended |
| 45.9057880 | 41,3 −31,2 | −4.7196 | 9 | 42.3 | CH313CH2CN and U−line |
| 80.3341357 | 71,6 −61,5 | −3.9846 | 15 | 52.1 | U-line |
| 91.4305056 | 81,8 −71,7 | −3.8180 | 17 | 56.4 | Unblended |
| 91.8099247 | 81,7 −71,6 | −3.8145 | 17 | 56.5 | CH3CONH2 |
| 102.8586736 | 91,9 −81,8 | −3.6698 | 19 | 61.3 | H2NC(O)NH2 |
| 103.2855074 | 91,8 −81,7 | −3.6663 | 19 | 61.4 | CH3C3N |
| 114.2866138 | 101,10 −91,9 | −3.5391 | 21 | 66.8 | CH3CH3NH2 |
| 137.1417100 | 121,12 −111,11 | −3.3177 | 25 | 79.3 | CH3NCO |
| 137.7107589 | 121,11 −111,10 | −3.3143 | 25 | 79.5 | Unblended |
| 148.5688153 | 131,13 −121,12 | −3.3223 | 27 | 86.4 | aGg′-(CH2OH)2 |
| 149.1852579 | 131,12 −121,11 | −3.2195 | 27 | 86.6 | CH334SH and CH313CCH |
Notes. (a)The rotational energy levels are labelled using the conventional notation for asymmetric tops: 
, where J denotes the angular momentum quantum number, and the Ka and KC labels are projections of J along the a and c principal axes. Lines that were already observed in Sanz−Novo et al. (2024a) are marked with a * symbol.
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