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Overlapping sequence of doubly excited series in the vuv spectrum of argon.

Observations of overlapping sequences of doubly excited resonances in the absorption spectrum of argon are reported at improved resolution, exhibiting more detail than earlier studies. Their appearance is compared with the doubly excited manifolds recently reported in the spectrum of He by Domke et al. [Phys. Rev. Lett. 66, 1306 (1991)] and by Zubek et al. [J. Phys. B 24, L342 (1991)]. The salient differences are pointed out and their origin is explained. The simplest case of overlapping channels has been accounted for by Lane's theory [J. Phys. B 17, 2213 (1984)] for one broad intruder in a Rydberg series of autoionizing resonances. Numerous interesting examples of the q-reversal effect are uncovered.