Table 2.
Transitions of HCN and its isotopologues used in this work.
| Species | Transition | Rest frequency | Eu | Aul | Ref. |
|---|---|---|---|---|---|
| [GHz] | [K] | [s−1] | |||
| HCN | 1–0 | 88.632 | 4.25 | 2.407 × 10−5 | 1 |
| 2–1 | 177.261 | 12.76 | 2.311 × 10−4 | ||
| 3–2 | 265.886 | 25.52 | 8.356 × 10−4 | ||
| 4–3 | 354.505 | 42.53 | 2.054 × 10−3 | ||
| H13CN | 1–0 | 86.340 | 4.14 | 2.226 × 10−5 | 1, 2 |
| 2–1 | 172.678 | 12.43 | 2.136 × 10−4 | ||
| 3–2 | 259.012 | 24.86 | 7.725 × 10−4 | ||
| 4–3 | 345.340 | 41.44 | 1.899 × 10−3 | ||
| HC15N | 1–0 | 86.055 | 4.13 | 2.203 × 10−5 | 1, 3 |
| 2–1 | 172.108 | 12.38 | 2.115 × 10−4 | ||
| 3–2 | 258.157 | 24.78 | 7.649 × 10−4 | ||
| 4–3 | 344.200 | 41.30 | 1.880 × 10−3 | ||
Notes. We use molecular data of HCN and its isotopologues from: 1) Navarro-Almaida et al. (2023), 2) Fuchs et al. (2004), 3) Cazzoli et al. (2005). The data were sourced from the CDMS catalogue (Müller et al. 2001, 2005; Endres et al. 2016), or via private communication with authors.
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