A ROTATIONAL ANALYSIS OF THE a $^{3}\pi - X ^{1}\Sigma^{+}$ SYSTEM OF AlBr
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Date
1982
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Ohio State University
Abstract
The a $^{3}\pi - X ^{1}\Sigma^{+}$ system of AlBr has been recorded in the region $4040-4370 \AA$ as part of our efforts to extend such observations to higher energies. The spectrum is in good agreement with that reported by $Sharma^{1}$ and Lakshminaragana and $Haranath^{2}$ except our resolution is considerably better than that used by Lakshminaragana and Haranath for their rotational analyses. The present analysis of the 0-0 band takes advantage of the known microwave transitions of AlBr by Wyse and $Gordy^{3}$, and it includes extensive data for both $Al^{79}Br$ and $Al^{81}Br$ which are present in approximately equal amounts. Rotational constants for both states, including those of spin orbit splitting and lambda-type doubling for the $^{3}\pi$ state, were determined and then merged with those obtained by fitting the microwave $transitions.^{3}$ A preliminary set of constants (in $cm^{-1}$) for the a $^{3}\pi$ state of $Al^{81}Br$ is given below; $ \begin{array}{lll} \upsilon_{00} = 23 794.60 & A = 131.20 & A_{0} = - 1.47 \times 10^{-4}\\ B = 0.163621 && D = 1.02\times 10^{-7} \end{array}$ A similar approach is underway for the analysis of transitions involving v = 1 and v = 2 of the a $^{3}\pi$ state.
Description
$^{1}$D. Sharma, Astrophya. J. 113, 219 (1951) $^{2}$A. Lakshminaragana, P. B. V. Haranath, Curr. Sci. 39, 228 (1970) $^{3}$F.C. Wyse. W., Gordy J., Chem. Phys, 56, 2130 (1972)