Observation of Several New Electronic Transitions of the $B_{2}$ Molecule

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1992

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Ohio State University

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Several new electronic transitions of the $B_{2}$ molecule have been observed in emission from a Corona Excited Supersonic Expansion of dilute diborane in helium. Two systems designated (1)$^{1}\Delta_{u}-b^{1}\Delta_{g}$ and (2)$^{3}\Pi_{u}$-(1)$^{3}\Pi_{g}$ have been analyzed based on spectra recorded at $1 cm^{-1}$ resolution with a 1.3m monochromator and optical multichannel analyzer. A third system, (2)$^{3}\Pi_{g}-A^{3}\Pi_{u}$, was recorded at Doppler limited resolution with the 1m Fourier transform spectrometer at Kitt Peak National Observatory. The results of these analyses and preliminary data on two weaker systems will be presented. The observations are in good agreement with recent high level theoretical calculations [1].

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1. S.R. Langhoff and C.W. Bauschlicher, JR., J. Chem. Phys. 95, 5882-5888 (1991).
Author Institution: Phillips Laboratory/RKFE

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