Using a photoionization mass spectrometer, the photoionization efficiency of ytterbium has been measured from 1350–2000 Å. The spectrum is dominated by line structure which tentative analysis indicates is due to the following configurations: 4f145dnp, 4f146pnd, 4f136s2nd, and 4f135d6snd. The ionization potential derived for Yb I from Rydberg series is 6.25 ± 0.01 eV.
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Parr et al. (1968) studied this question.
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