Characterization of the Interacting $(1)^{3}\Pi_{g}$ and $(2)^{3}\Pi_{g}$ States of the $B_{2}$ Molecule
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Date
1994
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Ohio State University
Abstract
An extensive series of bands connecting the $(1) \ {^{3}}\Pi_{g}$ and $(2) \ {^{3}}\Pi_{g}$ states with the $A^{3}\Pi_{u}$ state of the $B_{2}$ molecule have been observed in emission from a Corona Excited Supersonic Expansion of dilute dilute diborane in helium. The $(2)^{3} \Pi_{g-} \ A^{3} \Pi_{u}$ system was recorded at Doppler limited resolution with the Im Fourier transform spectrometer at Kitt peak National Observatory. The weak $(1)^{3}\Pi_{g}-A^{3} \Pi_{u}$ spectra were recorded at $1 cm^{-1}$ resolution with a 1.3m monochromator and optical multichannel analyzer. The $(1)^{3} \Pi_{g}$ and $(2)^{3} \Pi_{g}$ states have an avoided crossing and interact strongly. The $v = 0$ level of $(2)^{3} \Pi_{g}$ is perturbed by $v = 7$ of $(1)^{3} \Pi_{g}$. while the $v = 1$ level is perturbed by $v = 9$. The observation of emission from levels up to $v=9$ in $(1)^{3} \Pi_{g}$ has made possible the calculation of potential curves for the two states and a full deperturbation of the interacting vibrational levels. The results of this analysis will be presented.
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Author Institution: Phillips Laboratory/RKFE