Abstract
Classification of 75 spectral lines (hitherto not classified) in singly ionized praseodymium (Pr II) with the use of 31 new electron levels belonging to odd configurations 4f 35d and 4f 36s and 14 new levels belonging to even configurations is presented. Hyperfine structure constant A and B for each new level were determined by using the method of laser-induced fluorescence in a hollow cathode discharge.
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