HYPERFINE STRUCTURE OF Bal $X^{2}\Sigma'$
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Date
1985
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Ohio State University
Abstract
Among the alkaline warth mononalide radicals Bal presents a particular challence to the spectroscopist because of the extremely congested optical spectra. Recently Johnson $et al.^{1}$) succeeded in rotationally analyzing the $C^{2}\Sigma - X^{2}\Sigma^{2}(0,0)$ band system around 550 nm. For the correct identification of the observed hyperfine structure, however, an independent measurement of the X state hyperfine structure was required. Using the molecular beam laser-microwave double-resonance method we studied rotational transitions in the electronic ground state. At linewidths of about MHz the hyperfine structure from the weakly coupled iodine nucleus (1 = 5/2) was well resolved. Including the rotational constants of $X^{2}\Sigma^{+}$ from Forrine and $Doebl^{2}$) in a fit procedure we determined his parameters (35 errors in parentheses): \begin{eqnarray*} BaI\ X^{2}\Sigma^{+} v=0&& b = 93.14(7) MHz\\ && c = 52.2 (1) MHz\\ && eqQ = -33.3 (5) MHz \end{eqnarray*}
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$^{1)}$H. A. Johnson, C. Noda, J. S. McKillop, and R. N. Zare, Can. J. Phys., in press. $^{2)}$ k\""{o}rring and K. Doebl, Chem, Phys. Lett., in press.
Author Institution: Institute for Molecu\""{e}lphysik, Preie Universit\""{a}t Berlin Arnimallee 14
Author Institution: Institute for Molecu\""{e}lphysik, Preie Universit\""{a}t Berlin Arnimallee 14