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The experimental transition frequencies
were published by
(1) J. Xin and L. M. Ziurys,
1998, Astrophys. J. 495, L119.
The present parameters are very similar to the ones
reported there.
39K hyperfine splitting was not resolved;
it is probably negligible for observations of
late-type stars. Calculated transition frequencies
of the lower energy Π3/2 spin
component may be reliable throughout. Those in the
higher energy Π1/2 component should
be viewed with caution above 500 GHz,
especially for the higher frequency f
component.
July 2025: the reference was corrected.
The dipole moment was taken from an ab initio
calculation by
(2) H. S. P. Müller, 2018, unpublished.
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