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Table 2

Spectroscopic line parameters.

Molecule Transition Frequency (MHz) Eup (K) 2 (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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