Abstract
Barium spectra emitted from hollow cathode discharges and recorded with Fourier transform spectrometers in the region 1700–31 000 Å have been used for measuring 294 Ba I lines and 52 Ba II lines with uncertainties in the range ±0.001 cm-1 to ±0.01 cm-1. Energy level values have been derived from the measurements. The energy levels have been used for an improved determination of the Ba II ionization limit, giving the value 80686.30 ± 0.10 cm-1.
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