Abstract

Improved values of the previously known Br ii energy levels relative to the $4{\mathcal{p}}^4{}^3{P}_2$ ground level at 0.0 cm⁻¹ have been obtained from preliminary observations in the vacuum ultraviolet region. The position of the $4{\mathcal{p}}^4{}^1{S}_0$ level was found from the “forbidden” transition, $4{\mathcal{p}}^4{}^3{P}_1-4{\mathcal{p}}^4{}^1{S}_0$ 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 $4{\mathcal{p}}^4{}^3{P}_2-4{\mathcal{p}}^4{}^1{D}_2$, shows hyperfine-structure broadening consistent with the calculated structure. New values for the levels of $4{\mathcal{p}}^4$ 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 $4{\mathcal{p}}^4$, 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 $4{\mathcal{p}}^4$ are $F_2\left(4\mathcal{p},4\mathcal{p}\right)=1690{\text{cm}}^{-1}$ and $\zeta \left(4\mathcal{p}\right)=2800{\text{cm}}^{-1}$.

© 1961 Optical Society of America

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