| Molecule | Rate coefficients | Dipole moment | Energy levels |
| H2CO | Green (1991) | Fabricant et al. (1977) | Müller et al. (2005) |
| HCN | Monteiro & Stutzki (1986) | Ebenstein & Muenter (1984) | Müller et al. (2005) |
| HNC | Monteiro & Stutzki (1986) | Blackman et al. (1976) | Müller et al. (2005) |
| N2H+ | Daniel et al. (2005) | Havenith et al. (1990) | Caselli et al. (1995) |