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No pure rotational data are available for the BH
molecules. However, infrared transitions have been
reported by
(1) F. S. Pianalto, L. C. O'Brian, P. C. Keller,
and P. F. Bernath,
1988, J. Mol. Spectrosc. 129, 348.
Transitions up to J" = 7 may be found
within three to five times the predicted uncertainties.
11B hyperfine structure is probably negligible.
Ab initio calculations indicate the hfs components
with relative intensities of 1 : 3 : 2
to be displaced from the center frequency by about
–2.56, +0.27, and +0.87 MHz.
The dipole moment is from an ab initio calculation
from
(2) A. Halkier, H. Larsen, J. Olsen, P. Jørgensen,
and J. Gauss,
1999, J. Chem. Phys. 110, 734;
the value is in good agreement with an experimental value
of 1.27 ± 0.21 D, but probably more
accurate. The experimental value has been reported
by
(3) R. Thomson and F. W. Dalby,
1969, Can. J. Phys. 47, 1155.
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