Abstract

Application of intermediate coupling theory to 3d94s4p in Cu i and Zn ii revealed strong perturbations that could not be due to configuration types 3d10nl. The 3d94s4p levels except 4s4p(1P°)3d9 2P° were then fitted by including interaction with 3d84s24p. Energy parameters for 3d84s24p, for which no experimental levels are known, were fixed at values based on related spectra. The results show that this interaction accounts for the major distortions of 3d94s4p in Cu i and Zn ii. The resulting interaction-parameter values appear consistent with values for related iron-group spectra. The discrepancies between calculated and experimental positions for (¹P0)3d9²P012,12 are consistent with known 3d10np2P0 series perturbations in Cu i, Zn ii. Calculations without interaction for 4d95s5p in Ag i and Cd ii indicate interaction with 4d85s25p, but weaker than the corresponding interaction in the Cu i sequence. The levels of Tl iii (5d96s6p+5d107p) were fitted with configuration interaction. One experimental d9sp level is rejected in Zn ii, Ag i, and Tl iii. Corresponding new levels are found for Zn ii and Ag i. Leading eigenvector components for the d9sp levels in the [sp(SILI), d9]SL and [sp(SILI)JI, (d9)JII]J coupling schemes are given for all five spectra. The Tl iii levels are assigned JIJII names as most appropriate.

© 1969 Optical Society of America

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