Improved values of the previously known Br ii energy levels relative to the ground level at 0.0 cm−1 have been obtained from preliminary observations in the vacuum ultraviolet region. The position of the level was found from the “forbidden” transition, at 4042.42 A. An observation of the transverse Zeeman effect for this line yields a Lorentz triplet with the usual polarizations reversed and approximately the expected splitting. It is thus confirmed that the line arises from magnetic dipole radiation. A similar line at 8269.65 A, due to the transition , shows hyperfine-structure broadening consistent with the calculated structure. New values for the levels of are: 3P1 = 3136.4 cm−1, 3P0 = 3837.5 cm−1, 1D2 = 12 089.1 cm−1, and 1S0 = 27867.1 cm−1. The values for all levels above , as given in Atomic Energy Levels, Vol. II, should be reduced by 5.9 ± 0.5 cm−1. Intermediate-coupling parameter values which yield a good fit for Br ii are and .
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