Table 2
Spectroscopic line parameters.
| Molecule | Transition | Frequency (MHz) | Eup (K) | Sμ2 (D2) |
|
|
||||
| HCO+ | 6–5 | 535 061.581 | 89.9 | 91.3 |
| HCO+ | 8–7 | 713 341.228 | 154.1 | 121.7 |
| HCO+ | 11–10 | 980 636.494 | 282.4 | 167.3 |
| HCO+ | 12–11 | 1 069 693.891 | 333.8 | 182.5 |
|
|
||||
| H13CO+ | 6–5 | 520 459.884 | 87.4 | 91.3 |
| H13CO+ | 7–6 | 607 174.646 | 116.6 | 106.5 |
| H13CO+ | 9–8 | 780 562.812 | 187.3 | 136.9 |
|
|
||||
| N2H+ | 6–5 | 558 966.503 | 93.9 | 624.3 |
| N2H+ | 8–7 | 745 209.868 | 160.9 | 832.3 |
| N2H+ | 11–10 | 1 024 443.025 | 295.1 | 1144.3 |
Notes. We used the spectroscopic data parameters from Davies & Rothwell (1984), Kawaguchi et al. (1985), Hirota & Endo (1988), Botschwina et al. (1993), Lattanzi et al. (2007) and Tinti et al. (2007) for HCO+, from Gregersen & Evans (2001), Schmid-Burgk et al. (2004) and Lattanzi et al. (2007) for H13CO+ and, from Verhoeve et al. (1990), Havenith et al. (1990), Caselli et al. (1995), Amano et al. (2005) and Pagani et al. (2009) for N2H+. We note that all spectroscopic data are available from the Cologne Database for Molecular Spectroscopy molecular line catalog (CDMS, Müller et al. 2005) at Splatalogue (http://www.splatalogue.net; Remijan et al. 2007).
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