The experimental lines are from
(1) S. Yamamoto and S. Saito, 1994, Can. J. Phys. 72, 954,
and from
(2) M. Tanimoto, T. Klaus, H. S. P. Müller, and G. Winnewisser, 2000, J. Mol. Spectrosc. 199, 73.
The sextic distortion term H_K was kept fixed to a value from
(3) S. H. Ashworth, K. M. Evenson, and J. M. Brown, 1995, J. Mol. Spectrosc. 172, 282.
The ¹H hyperfine splitting is negligible for most transitions. Because of significant splitting occuring in different frequency regions and at various quantum numbers we provide an entry with complete hfs splitting. Because of the small number od observed transitions with hfs splitting and because of the setup of the input files, no experimental lines have been merged. Predictions of a-type transitions with predicted uncertainties larger than 1 MHz or b-type transitions with K_a > 3 – 2 should be viewed with caution.
The dipole moment is from an ab initio calculation from
(4) K. A. Peterson, A. Mitrushchenkov, and J. S. Francisco, 2008, Chem. Phys. 346, 34.