Table 1:

Spectroscopic parameters of the observed transitions.
Transition Frequency El gl gu $\mu^{2}S$a 102Aij
  ( MHz) (cm-1)     ($\rm {D}^2$) (s-1)
OH+ N=1-0b
J=1-0
F=1/2-1/2 $909045.2\pm1.5$ 0.004 4 6 1.20 1.05
1/2-3/2 $909158.8\pm1.5$ 0 2 4 2.40 0.52
J=2-1
F=5/2-3/2 $971803.8\pm1.5$ 0 4 6 10.24 1.82
3/2-1/2 $971805.3\pm1.5$ 0.004 2 4 5.69 1.52
3/2-3/2 $971919.2\pm1.0$ 0 4 4 1.14 0.30
o-H2O+ 111-000c
J=3/2-1/2
F=3/2-1/2 $1115150.0\pm1.8$ 0.004 2 4 4.14 1.67
1/2-1/2 $1115186.0\pm1.8$ 0.004 2 2 3.32 2.68
5/2-3/2 $1115204.0\pm1.8$ 0 4 6 11.23 3.02
3/2-3/2 $1115263.0\pm1.8$ 0 4 4 3.35 1.35
1/2-3/2 $1115298.7\pm1.8$ 0 2 2 0.42 0.34
J=1/2-1/2
F=3/2-1/2 $1139541.1\pm1.8$ 0.004 2 2 0.42 3.61
1/2-1/2 $1139560.6\pm1.8$ 0.004 2 4 3.35 1.44
5/2-3/2 $1139653.5\pm1.8$ 0 4 2 3.32 2.86
3/2-3/2 $1139673.3\pm1.8$ 0 4 4 4.14 1.78
H3O+d
00- - 10+ $984711.9\pm0.1$e 5.1 4 12 8.30 2.30
11- - 11+ $1655834.8\pm0.3$f 0 6 6 6.22 5.48
22- - 22+ $1657248.4\pm0.3$e 29.6 10 10 4.67 7.32

Notes.  (a) Dipole moments ($\mu$): 2.256 D (OH+; Werner et al. 1983); 2.37 D (H2O+; Wu et al. 2004); 1.44 D (H3O+; Botschwina et al. 1985). Frequencies from: (b) Müller et al. (2005). (c) Mürtz et al. (1998); (d) Yu et al. (2009). (e)  $\int T_A {\rm d} v < 0.482$ K km s-1 for the 984.7 GHz line, and <2.412 K km s-1 for the 1657.2 GHz lin. (f) Blended with a strong 212-110 ortho-H218O line at 1 655 831 MHz.


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