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November 1, 1967Journal of Research of the National Bureau of Standards Section A Physics and ChemistryOpen Access

The fifth spectrum of praseodymium

Victor Kaufman Jack Sugar

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Abstract

Twelve spectral lines of quadruply-ionized praseodymium in the region 840 to 2250 Å are reported. Five terms (4f 2F, 5d 2D, 6s 2S, 6p 2P, and Is 2S) and the hyperfine splitting of the 6s 2S term are given. A calculation of the principal ionization energy (Pr4+ → Pr5+) leads to a value of 57.44 eV with an estimated uncertainty of ±0.05 eV.

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Kaufman et al. (1967) studied this question.

synapsesocial.com/papers/6a89199ed7d368998876054c https://doi.org/10.6028/jres.071a.049

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