**Table 1:** Summary of adopted dipole moments^a,b.
Molecule $^{\it a}$	$\mu_0$	$\mu_{\rm e}$	Method	reference
	[D]	[D]
CO	0.110		expt.	1
SO	$1.52\pm .02$		expt.	2
SO₂	1.633		expt.	3
CS	$1.958\pm .005$		expt.	4
SiO	3.098		expt.	5
SiS	$1.73\pm .06$		expt.	6
HCO⁺	$-3.93\pm .01$	$-3.90\pm .01$	ab initio	7
HOC⁺	2.74	2.8	ab initio	8, 9
OCS	0.7152		expt.	10
HC₃N	3.732		expt.	11
HCN	2.985		expt.	12
HNC	$3.05\pm .1$		expt.	13
HNCO	1.602		expt.	14
c-C₃H₂	$3.27\pm .01$		expt.	1
CH₃CN	3.922		expt.	15
H₂CO	2.332		expt.	16
N₂H⁺		3.4	ab initio	17
HCS⁺	1.958		ab initio	18
CH₃OH	0.896		expt.	19
NH₃	$1.476\pm .002$		expt.	20
H₂O	1.847		expt.	21
SiC₂	$2.393\pm .006$		expt.	22
HCl	1.109		expt.	23
OH	1.655		expt.	24
H₃O⁺	1.44		ab initio	25

^a Same data are also adopted for isotopes and deuterated species,unless stated in the datafile.

^b All values are in units of debye (D), where 1 D = 10^-18 esu cm. When the original source has presented $\mu$ in atomic units, a conversion factor of 1 au = ea₀ = 2.54175 D has been applied.

Refs. - (1) Goorvitch (1994); (2) Lovas et al. (1992); (3) Patel et al. (1979); (4) Winnewisser & Cook (1968); (5) Raymonda et al. (1970); (6) Hoeft et al. (1969); (7) Botschwina et al. (1993); (8) Botschwina (1989); (9) Defrees et al. (1982); (10) Muenter (1968); (11) DeLeon & Muenter (1985); (12) Ebenstein & Muenter (1984); (13) Blackman et al. (1976); (14) Hocking et al. (1975); (15) Gadhi et al. (1995); (16) Fabricant et al. (1977); (17) Green et al. (1974); (18) Botschwina & Sebald (1985); (19) Sastry et al. (1981); (20) Cohen & Poynter (1974); (21) From JPL based on Camy-Peyret et al. (1985); (22) Suenram et al. (1989); (23) De Leeuw & Dymanus (1971); (24) Peterson et al. (1984); (25) Botschwina et al. (1984).

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	1 Introduction
	2 Energy levels
	3 Radiative rates
	4 Collisional rate coefficients
	5 Summary
	References
	Online Material
	6 Extrapolation of collisional rate coefficients