Table 2
Spectroscopic properties of the J = 1−0 lines of H35Cl and H37Cl.
| Species | Transition | Frequency (GHz) | HFS velocity offset (km s−1) | Eup (K) | gup | Aij ×10−3 (s−1) | |
|---|---|---|---|---|---|---|---|
| J′ − J″ | F′ − F″ | ||||||
| H37Cl | 1−0 | 3/2−3/2 | 624.964374(100) | 6.45 | 30.0 | 4 | 1.19258 |
| 5/2−3/2 | 624.977821(100)* | 0.00 | 6 | 1.19263 | |||
| 1/2−3/2 | 624.988334(100) | −5.04 | 2 | 1.19271 | |||
| H35Cl | 1−0 | 3/2−3/2 | 625.901603(100) | 8.22 | 30.0 | 4 | 1.16915 |
| 5/2−3/2 | 625.918756(100)* | 0.00 | 6 | 1.16920 | |||
| 1/2−3/2 | 625.932007(100) | −6.35 | 2 | 1.16929 | |||
Notes. The frequencies marked with an asterisk correspond to the strongest HFS line and is used as the rest frequency to set the velocity scale. Numbers in parentheses indicate experimental errors in the frequency in the last decimal place. The spectroscopic parameters are taken from the JPL spectral line catalogue (Pickett et al. 1998) with experimental measurements carried out by de Leluw & Dymanus (1973) and Nolt et al. (1987).
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