A critical compilation of energy levels and spectral lines of neutral boron

Observed spectral lines of neutral boron are critically compiled. From the selected best measurements, an improved and extended set of energy levels is derived for the two most abundant isotopes, 11B and 10B. The ionization energy is determined to a greater precision than previously given values. The connection between the quartet and doublet term systems is revised on the basis of an isoelectronic extrapolation.

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