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The experimental lines were taken from
(1) L. Kolesniková, I. León, E. R. Alonso,
S. Mata, and J. L. Alonso,
2021, Angew. Chem. Int. Ed. 60, 24461.
Some additional spectroscopic parameters were estimated.
Two transitions with large residual were omitted from the fit,
one with a somewhat large residual was retained.
The data set is somewhat limited, but calculations for
Ka = 0 may be reliable throughout,
those with Ka = 1 possibly up to 50 GHz,
while extrapolations to Ka = 2
should be viewed with great caution.
The dipole moment components are from a quantum
chemical calculation in (1); however, c-type
transition can not be calculated with confidence.
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