ARGON, krypton, and xenon when they are excited to their second stage of ionisation give rise to spectra which should theoretically come under quintet and triplet systems. The position of

different transitions can without difficulty be predicted with the help of the ‘irregular doublet’ law and the ‘horizontal comparison’ law (Ind. J. Phy., vol. 3, part 1; 1928). Thus, with

the knowledge of the nature and the position of the spectra we could identify certain lines and finally classified lines arising from the transitions below:

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