ROTATIONAL ANALYSIS OF THE $A^{2}\Pi - X^{2}\Sigma^{+}$ AND $B^{2}\Sigma^{+} - X^{2}\Sigma^{+}$ TRANSITIONS OF YbBr USING LASER EXCITATION AND RESOLVED FLUORESCENCE
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Date
2001
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Publisher
Ohio State University
Abstract
High-resolution laser excitation spectra have been recorded for the first time for YbBr. Data for the 0-0 and 1-0 bands of the $A^{2}\Pi - X^{2}\Sigma^{+}$ system and the 0-0, 1-0 and 1-1 bands of the $B^{2}\Sigma^{+} - X^{2}\Sigma^{+}$ system were obtained using selective detection of fluorescence. The lowest vibrational levels of the $A^{2}\Pi_{3/2}$ and $B^{2}\Sigma^{+}$ states are shown to be separated by $\approx 400 cm^{-1}$, and exhibit the characteristics of a mutually perturbing pair. Through observation of symmetry forbidden transitions in the $B^{2}\Sigma^{+} - X^{2}\Sigma^{+}$ system, mixing of the A and B states is apparent. A resolved fluorescence study has also been undertaken by observing the 0-1, 0-2 and 0-3 bands in the $A^{2}\Pi_{1/2} - X^{2}\Sigma^{+}$ system. A least-squares merged fit of the estimated parameters from individual bands was performed to remove redundancies, the results of which will be presented.
Description
Author Institution: Dalhousie University; Department of Chemistry, Dalhousie University; Department of Chemistry, University of New Brunswick