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The spectrum of Cr IV has been observed by using a vacuum sliding-spark discharge and a 3-m normal incidence spectrograph. 275 lines have been classified in the region from 523 to 2 423 Å. All terms of the configurations 3 d 3 , 3 d 2 4 s and 3 d 2 4 p , except 3 d 2 ( 1 S )4 s 2 S , have been established.
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Jan Ekberg (1973) studied this question.
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