Abstract

4f2 – 4f5g transitions in Pr XII and Nd XIII spectra excited in laser-produced plasma and low-inductance vacuum spark sources were analyzed in the extreme vacuum ultraviolet region. These transitions were observed for the first time in the Cd I isoelectronic sequence. Thirty two (32) spectral lines have been classified in each spectrum, and 24 levels in Pr XII and 23 levels in Nd XIII out of 28 possible levels of 4f5g configuration have been determined. The level value of the 6s6p 1P1 level of Pr XII has been revised from 784690 cm-1 to 791365 cm-1 based on the new calculations and measurements. The 5s6p 1P1 level in Pr XII was also revised on the basis of new measurements. Semi-empirical Least-Squares-Fitting calculations in the frame of Hartree–Fock technique confirmed the experimentally determined energy structures of 4f5g configuration in Pr XII and Nd XIII.

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