Electronic transitions in B i–B iv have been studied with the beam-foil technique. Over 100 spectral lines were observed between 450 and 5000 Å. Only half of the lines could be assigned to earlier known boron transitions. Classifications are given for several of the new lines. Mean lives of 33 excited levels in B i–B iv were measured. In most cases the results are in good agreement with theory.
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Decay curve corrected for cascades.
Every mean life was measured at least three times. The errors are estimated maximum uncertainties, taking into account a 3% uncertainty in the particle velocity after the foil.
Blended with the B ii 2393-Å line.
Decay curve corrected for cascades.
Every mean life was measured at least three times. The errors are estimated maximum uncertainties, taking into account a 3% uncertainty in the particle velocity after the foil.
Blended with the B ii 2393-Å line.