Abstract
The highly congested spectra of the 0–0, 1–0, 0–1, and 1–1 bands of the B 2Σ +← X 2Σ + system of YbBr have been analyzed for the 174Yb 79Br, 174Yb 81Br, 172Yb 79Br, and 172Yb 81Br isotopomers. A multi-isotopomer, multi-band fit of all data was employed in the determination of an isotopically consistent set of equilibrium parameters. From the fitted B e values, estimates of the equilibrium bond lengths for the B and X states of YbBr were calculated as 2.58275(1) and 2.645386(4) Å, respectively. Differences in the electronic term values between the 172YbBr and 174YbBr isotopomers have been interpreted in terms of the Field Shift Effect. This effect, well known in atomic spectroscopy, is the result of a small difference in the nuclear charge distribution between the 172Yb and 174Yb nuclei, and has been observed for very few molecules.
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