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Please note that the identities of the exited states are not known.
They have been numbered from low energies to higher energies.
This state is the lowest excited vibrational state.
The next state is at about four times the energy !
The transition frequencies were taken from
(1) D. J. Tyree, T. W. Chapman, I. R. Medvedev, Z. Kisiel,
2022, J. Mol. Spectrosc. 390, Art. No. 111706.
The transition frequencies were judged conservatively
and were adjusted from 50 to 35 kHz. A small number of lines
with larger residuals was omitted. The parameter set differs slightly
from that in (1). The calculations should be accurate enough
for all observational purposes. Transition frequencies with
calculated uncertainties larger than 0.2 MHz should
be viewed with caution.
The partition function considers the ground vibrational
state only.
Vibrational correction factors have been derived.
Please do note the caveats !
Spin-statistical weights of the ratio 13 : 11 were
omitted as they are close to 1 : 1. In v1,
Ka + Kc even and odd
would carry the weights of 13 and 11, respectively.
The ground state dipole moment was determined in
(2) R. D. Brown, P. D. Godfrey, and J. Storey,
1975, J. Mol. Spectrosc. 58, 445.
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