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The fifth spectrum of praseodymium

1967; The National Institute of Standards and Technology; Volume: 71A; Issue: 6 Linguagem: Inglês

10.6028/jres.071a.049

2376-5704

Victor Kaufman, Jack Sugar,

Radioactive element chemistry and processing

Twelve spectral lines of quadruply-ionized praseodymium in the region 840 to 2250 Å are reported. Five terms (4f2F, 5d2D, 6s 2S, 6p2P, and Is2S) 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.