All five levels of the ground configuration 4p 4 and all the ten 5s, along with eighteen 4d, eight 5d, seven 6s and two 7s levels, built on the 4p 3 core have been determined. The analysis is based on 99 classified lines. The ionization potential 4p 4 3 P 2 -4p 3 4 S 3/2 is found to be 719950+or-2000 cm -1 .
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Chaghtai et al. (1973) studied this question.
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