Abstract
Synopsis The analysis of the Ta I-spectrum is continued. A few ground levels and a great number of high odd levels are found in addition to those given previously. Moreover a group of high even levels is discovered from which the ionization potential is found to be (7.77 0.10) Volt. The total number of classified Ta I-lines is now 1262, corresponding to transitions between 22 even ground levels, 182 odd levels and 8 high even levels. All newly classified lines and Zeeman-effect data are presented. The interpretation of the detected energy levels is revised and extended. Configuration calculations concerning the low even levels, using the method of Racah, are helpful in locating and interpreting a number of them. Typical perturbations are pointed out.
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