Table 2.
Spectroscopic properties of the studied species and transitions.
| Species | Transition |
Frequency | AE | Eu | Receiver/telescope | θFWHM | |
|---|---|---|---|---|---|---|---|
| J′−J″ | F′−F″ | [GHz] | [s−1] | [K] | [″] | ||
| ArH+ | 1−0 | – | 617.5252(2) | 0.0045 | 29.63 | SEPIA660/APEX | 10.3 |
| p-H2O+ | 3/2−1/2 | – | 604.6841(8) | 0.0013 | 29.20 | SEPIA660/APEX | 10.3 |
| NKaKc = 11,0 − 10,1 | 3/2−3/2 | – | 607.2258(2) | 0.0062 | 29.20 | SEPIA660/APEX | |
| OH+ | 2−1 | 5/2−3/2 | 971.8038(1) (*) | 0.0182 | 46.64 | HIFI/Herschel | 22.0 |
| N = 1−0 | 3/2−1/2 | 971.8053(4) | 0.0152 | ||||
| 3/2−3/2 | 971.9192(11) | 0.0030 | |||||
| 1−1 | 1/2−1/2 | 1032.9985(7) | 0.0141 | 49.58 | 1.05THz Rx./APEX | 6.4 | |
| 3/2−1/2 | 1033.0040(10) | 0.0035 | |||||
| 1/2−3/2 | 1033.1129(7) | 0.0070 | |||||
| 3/2−3/2 | 1033.1186(10) (*) | 0.0176 | |||||
| o-H2O+ | 3/2−1/2 | 3/2−1/2 | 1115.1560(8) | 0.0171 | 53.52 | HIFI/Herschel | 20.0 |
| NKaKc = 11,1 − 00,0 | 1/2−1/2 | 1115.1914(7) | 0.0274 | ||||
| 5/2−3/2 | 1115.2093(7) (*) | 0.0309 | |||||
| 3/2−3/2 | 1115.2681(7) | 0.0138 | |||||
| 1/2−3/2 | 1115.3035(8) | 0.0034 | |||||
| HF | 1−0 | – | 1232.4762(1) | 0.0242 | 59.14 | HIFI/Herschel | 17.0 |
| CO | 1−0 | – | 115.2712(0) | 7.203×10−8 | 5.53 | SEST | 43.0 |
Notes. The spectroscopic data are taken from the Cologne Database for Molecular Spectroscopy (CDMS, Müller et al. 2005). The H2O+ frequencies were actually refined considering astronomical observations (see Appendix A of Muller et al. 2016), for which the upper level energies are given with respect to the ground state of p-H2O+ (NKaKc = 10,1). For the rest frequencies, the numbers in parentheses give the uncertainty in the last listed digit.
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