Table 3
Detected spectral lines and selected spectroscopic parameters.
| Transition | ν | Eu ∕kB | μ | B |  |
 |
 |
|---|---|---|---|---|---|---|---|
| [MHz] | [K] | [D] | [MHz] | ||||
| SO(NJ = 44−33) | 172 181.40340 | 33.77 | 1.535 | 21 523.556 | 15.903 | 15.904 | 9.409 |
| H13CN(J = 2−1) | 172 677.95900(a) | 12.43 | 2.9852 | 43 170.127 | 14.621 | 14.622 | 4.858 |
| H13CO+(J = 2−1) | 173 506.70810(b) | 12.49 | 3.90 | 3377.30 | 4.852 | 4.852 | 58.173 |
| SiO(J = 4−3) | 173 688.31 | 20.84 | 3.098 | 21 711.96 | 9.338 | 9.339 | 9.330 |
| HN13C(J = 2−1) (c) | 174 179.411 | 12.54 | 2.699 | 43 545.61 | … | 4.835 | 4.819 |
| C2H(N = 2−1) | 174 663.199(d) | 12.58 | 0.769 | 3674.52 | 19.284 | 19.284 | 53.495 |
Notes. The spectroscopic data were compiled from the CDMS database unless otherwise stated. In Cols. 2–5 we list the line rest frequency, upper-state energy divided by the Boltzmann constant, permanent electric dipole moment, and the rotational constant of the molecule. In Cols. 6–8 we tabulate the partition function values at Tex = 9.375 K taken from the CDMS and JPL databases and calculated using Eq. (5), respectively (Sect. 3.3). (a) Frequency of the strongest hyperfine component F = 3−2 (relative intensity Ri = 7∕15) taken from the JPL database. (b)Frequency of the strongest hyperfine component F1, F = 5∕2, 3−3∕2, 2 (Ri = 7∕20). (c) The quoted parameters for HN13C(J = 2−1) were taken from the JPL database (not available in the CDMS). (d) Frequency of the strongest hyperfine component J, F = 5∕2, 3−3∕2, 2 (Ri = 7∕20; Padovani et al. 2009, Table 5 therein).
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