Sugar Jack
Institute for Basic Standards, National Bureau of Standards, Washington, D.C. 20234.
J Res Natl Bur Stand A Phys Chem. 1969 May-Jun;73A(3):333-381. doi: 10.6028/jres.073A.029.
Measurements of the spectrum of doubly ionized praseodymium from 821 to 2103 Å are given. One hundred fifty-three energy levels deduced from these wavelengths and an earlier line-list of longer wavelengths are presented. These levels are identified with the configurations 4f6s, 4f7s, 4f8s, 4f6p, 4f6d, 4f5f, 5d4f, and 4f5d6s and are given term designations. Radial energy integrals belonging to these configurations are parametrically deduced from the known levels. A value of 21.625 eV (174420 cm) for the ionization energy of Pr iii, with an estimated uncertainty of 0.016 eV (130 cm), is derived from the 4fns series (n = 6, 7, 8).
给出了从821到2103埃的双电离镨光谱的测量结果。根据这些波长以及一份更早的更长波长谱线列表推导出了153个能级。这些能级与4f6s、4f7s、4f8s、4f6p、4f6d、4f5f、5d4f和4f5d6s组态相对应，并给出了谱项符号。属于这些组态的径向能量积分通过已知能级参数推导得出。从4fns系列（n = 6、7、8）得出Pr iii的电离能为21.625电子伏特（174420厘米），估计不确定度为0.016电子伏特（130厘米）。
