Hyperfine Structure of the Spectra of Pr I and Pr II

抄録

In the spectrum of Pr I three lines were classified and the hfs was measured, from which the interval factor of the level 4f³6s^{2 4}I_11⁄2 was determined. From this and the known interval factor of 4f³6s^{2 4}I_9⁄2 it was concluded that the value of a_4f determined from the hfs of Pr II is also appropriate for Pr I. The configuration 4f³(⁴I)6s of Pr II was treated as of intermediate coupling, and the hfs lead to a reasonable value of a_4f and a(6s). From the value of a(6s) the magnetic moment of Pr¹⁴¹ was calculated to be 4.0±0.2 n.m.