Structure of the Barium Resonance Line

For the Ba i line 6s²¹S₀-6s6p¹P₁, the structure ${0.0}¹³⁸{[{-}{3.1}5/2, +{9.9}3/2, +{17.7}1/2]}¹³⁷+{3}¹³⁶{[{-}{0.3}5/2, +{11.4}3/2, +{18.4}1/2]}¹³⁵+{5}¹³⁴$ is suggested as being consistent with the experimental evidence (subscripts are $¹P₁$ $F-values; superscripts, isotopes; numbers on the line, wave numbers relative to isotope 138, expressed in mK ≡{10}^{{-}3}$ ${cm}^{{-}1}$).