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A combined fit of v = 0, v11 = 1
μ2Σ, and v11 = 1
2Δ was performed.
The FTMW and millimeter data were published by
(1) C. A. Gottlieb, M. C. McCarthy, and P. Thaddeus,
2010, Astrophys. J. Suppl. Ser. 189, 261.
The parameter bF was identical within uncertainties
for the three vibrational states, and the values were thus
locked to the same value. One transition frequency with
large residuals was omitted.
The origin was kept fixed to the value from
(2) D. Zhao, M. A. Haddad, H. Linnartz, and W. Ubachs,
2011, J. Chem. Phys. 135, Art. No. 044307.
The calculation was truncated at 300 GHz, transition
frequencies should be reliable up to that frequency.
At low frequencies, the 1H hyperfine splitting
may be resolvable in space. Therefore, a separate calculation with
hyperfine splitting is available up to 50 GHz.
NOTE: the partition function does
take into account the hyperfine splitting as well as the two
excited vibrational states!
The dipole moment is from an ab initio calculation
by
(3) D. E. Woon,
1995, Chem. Phys. Lett. 244, 45.
Please note that the dipole moment may be slightly overestimated
because of some mixing between the 2Πi
and the 2Σ state.
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