Boron monohydride, X 1Σ+
Species tag 012502
Date of EntryJuly 2008
ContributorH. S. P. Müller

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.

Lines Listed15
Frequency / GHz< 10145
Max. J15
log STR0-4.0
log STR1-6.0
Isotope Corr.-0.0964
Egy / (cm–1)0.0
 µa / D1.356
 µb / D 
 µc / D 
 A / MHz 
 B / MHz354227
 C / MHz 
detected in ISM/CSMno

Database maintained by Holger S. P. Müller and Sven Thorwirth, programming by D. Roth and F. Schloeder