Abstract
Absorption spectra of the A 2 Π←X 2 Σ + system of YbBr have been recorded at high resolution using a single frequency cw laser arrangement. Analysis of the A– X system was challenging, owing to the high degree of spectral congestion, resulting from the small, and similar, rotational constants for both states, as well as a large number of observable isotopomers. Data for both the 0–0 and 1–0 bands of 174Yb 79Br and 174Yb 81Br, were employed simultaneously in a least squares fit that produced estimates of the molecular parameters for the A state. Fitted B e values were used to calculate a highly accurate equilibrium bond length for the A state, R e=2.595406(5) Å. Comparisons with the analogous A– X systems of YbF and YbCl are described.
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