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The experimental lines are from
(1) Y. Endo, S. Saito, and E. Hirota,
1981, J. Chem. Phys. 75, 4379.
With respect to the first entry of Sep. 2012,
additional millimeter and submillimeter data
were provided by
(2) G. Cazzoli, V. Lattanzi, T. Kirsch, J. Gauss,
B. Tercero, J. Cernicharo, and C. Puzzarini,
2016, Astron. Astrophys. 591, Art. No. A126.
With respect to the second entry of July 2016,
transition frequencies from astronomical observations
toward TMC-1 CP were included. These were reported
by
(3) N. Marcelino, C. Puzzarini, M. Agúndez,
R. Fuentetaja, B. Tercero, P. de Vicente, and J. Cernicharo,
2023, Astron. Astrophys. 674, Art. No. L13.
Calculations of a-type transitions should be
be sufficiently accurate, but b-type
transitions with Ka > 1
should still be viewed with caution.
Transition frequencies with calculated uncertainties
exceeding 0.2 MHz should be viewed with caution.
The dipole moment is from a quantum-chemical calculation
by
(4) H. S. P. Müller,
2012, unpublished.
A published value for the a dipole moment component
agrees well with the calculated one.
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