B. Edlén, A. Ölme, G. Herzberg, and J. W. C. Johns, "Ionization Potential of Boron, and the Isotopic and Fine Structure of 2s2p2 2D," J. Opt. Soc. Am. 60, 889-891 (1970)
The nf2F series (n = 4–11) of B i is found from combinations with 3d2D and 2s2p2 2D, and the series limit is derived by means of a Ritz formula, yielding an ionization potential of 66 928.10±0.1 cm−1. The same value applies to both 10B and 11B because the isotope shift of the ground state is shown to be zero. From the resolved structure of the transition 2s2p2 2D–4f2F at 8212 Å, we derive for 2s2p2 2D a fine-structure interval of −0.31 cm−1 and an isotope shift of −0.58 cm−1, corresponding to a specific mass shift of −0.67 cm−1.
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From P. Gunnvald and L. Minnhagen, Arkiv Fysik 22, 327 (1962).
Measurements kindly communicated in advance of publication by U. Litzén.
Calculated from 2Fc.g. by assuming normal isotope shift (0.034cm−1) and hydrogenic spin–orbit splitting (0.008 cm−1).
Table II
The series 2s2p2 2D–2s2nf2F observed in absorption by flash-photolysis technique.
From P. Gunnvald and L. Minnhagen, Arkiv Fysik 22, 327 (1962).
Measurements kindly communicated in advance of publication by U. Litzén.
Calculated from 2Fc.g. by assuming normal isotope shift (0.034cm−1) and hydrogenic spin–orbit splitting (0.008 cm−1).
Table II
The series 2s2p2 2D–2s2nf2F observed in absorption by flash-photolysis technique.
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