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The measurements were taken from
(1) D. T. Halfen, D. J. Clouthier, and L. M. Ziurys,
2014, Astrophys. J. 796, Art. No. 36;
and from
(2) L. Kang and S. E. Novick,
2004, J. Mol. Spectrosc. 225, 66.
14N and 31P hyperfine structure splitting
was resolved in (2). The latter is not resolvable in
astronomical observations, and the former only if the
molecule would be detected in cold environments.
The predictions are probably sufficient for all
astronomical purposes.
The dipole moment is from an ab initio calculation
from
(3) A. V. Glezakou, S. T. Kapellos, and A. Mavrides,
1994, Theochem 305, 225.
The value refers to the total dopole moment, but the a
dipole component accounts for most of it. There is a b
dipole component of about 0.5 D, but b-type transitions
cannot be reliably predicted at present.
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