Phys. Rev. A 56, 1650–1653 (1997)Doubly excited resonance structures in He photoionization from 1s2s1,3S metastable statesReceived 28 October 1996; revised 20 March 1997; published in the issue dated August 1997 The resonant structures corresponding to selected He sp, 2n± and 2pnd1,3Po autoionization series below the He+ N=2 threshold, following photoionization from 1s2s1,3S metastable states, are examined in detail. Theoretical photoionization cross sections, calculated using a B-spline-based configuration-interaction approach with a length-velocity agreement better than 1%, are presented. A sign change in Fano profile parameters q in 1s2s1S→sp,2n+1P transitions along the 2n+ autoionization series is identified and analyzed. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.56.1650
DOI:
10.1103/PhysRevA.56.1650
PACS:
32.80.Fb, 32.80.Dz, 32.70.Jz, 31.25.Jf
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