Table 2
Spectroscopic properties of the studied species and transitions.
| Species | Transition | Frequency | AE | Eu | Receiver/Telescope | |
|---|---|---|---|---|---|---|
| J′−J′′ | F′−F′′ | (GHz) | (s−1) | (K) | ||
| ArH+ | 1−0 | – | 617.5252(2) | 0.0045 | 29.63 | SEPIA660/APEX |
| p-H2O+ | 3∕2−1∕2 | – | 604.6841(8) | 0.0013 | 59.20 | SEPIA660/APEX |
 |
3∕2−3∕2 | – | 607.2258(2) | 0.0062 | 59.20 | SEPIA660/APEX |
| OH+ | 1−1 | 1∕2−1∕2 | 1032.9985(7) | 0.0141 | 49.58 | 1.05THz Rx./APEX |
| N = 1−0 | 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)(a) | 0.0176 | ||||
| o-H2O+ | 3∕2−1∕2 | 3∕2−1∕2 | 1115.1560(8) | 0.0171 | 53.52 | HIFI/Herschel |
 |
1∕2−1∕2 | 1115.1914(7) | 0.0274 | |||
| 5∕2−3∕2 | 1115.2093(7)(a) | 0.0309 | ||||
| 3∕2−3∕2 | 1115.2681(7) | 0.0138 | ||||
| 1∕2−3∕2 | 1115.3035(8) | 0.0034 | ||||
| CH | 3∕2−1∕2 | 1−1 | 2006.74886(6) | 0.0111 | 96.31 | upGREAT/SOFIA |
| 2Π3∕2, N = 2−1 | 1−0 | 2006.76258(6) | 0.0223 | |||
| 2−1 | 2006.79906(6)(a) | 0.0335 | ||||
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 the rest frequencies, the numbers in parentheses give the uncertainty in the last listed digit. (a) Indicates the strongest hyperfine structure transition, which was used to set the velocity scale in the analysis.
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