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The pure rotational data have been
reported by
(1) Y. Kawashima, Y. Endo, K.Kawaguchi, and E. Hirota,
1987, Chem. Phys. Lett. 135, 441.
Even though 11B hyperfine structure was resolved
only up to J = 2 – 1,
the apparent line maxima are somewhat different from the
hyperfine-free line centers, though only slightly for
only up to J = 5 – 4.
Therefore, no transitions have been merged.
The predictions are deemed to be reliable up to
about 1.2 THz, possibly higher.
At low J, it is possible to resolve the
11B hyperfine splitting. Therefore, a separate
hyperfine calculation up to J' = 5
is provided. Note: The partion
function given below takes into account this splitting !
The dipole moment is from an ab initio calculation
from
(2) N. J. DeYonker, S. Li, Y. Yamaguchi, H. F. Schaefer, III,
T. D. Crawford, R. A. King, and K. A. Peterson,
2005, J. Chem. Phys. 122, Art.-No. 234316.
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