Abstract
The 3p54s23d1P1 and 3p5(2P3/2)4s25s2[3/2]1 resonance regions of Ca atoms have been studied experimentally with the aid of synchrotron radiation excited electron spectroscopy. The strong configuration interaction of the 3p54s23d, 3p54s25s and several other nearly degenerate configurations leads to complex structures observed in the photoelectron yield spectrum. Multiconfiguration Dirac–Fock (MCDF) calculations have been performed for these 3p-excited resonances of neutral calcium and compared to experimental results. The excitation and subsequent autoionization of these resonances lead to the final ionic 3p6nl states from which new high-lying members of the Rydberg p-series have been resolved experimentally. These new levels agree reasonably well with calculations as well as with the extrapolation of the Rydberg formula. The post collision interaction (PCI) effect has been observed in the transition Ca+ 3p53d4s2P1/2,3/2→ Ca2+ 3p61S0+eAuger− and explained by means of the rather long core-hole lifetime, while the decay of Ca+ 3p53d4s4P1/2,3/2,5/2 states is not affected by PCI.
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