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Dramatic Changes in the 3 s Autoionization Process at the Beginning of the Ar I Sequence

1997; American Physical Society; Volume: 78; Issue: 16 Linguagem: Inglês

10.1103/physrevlett.78.3082

1092-0145

Paul van Kampen, G. O’Sullivan, V. K. Ivanov, A. N. Ipatov, John Costello, E. T. Kennedy,

Advanced Chemical Physics Studies

The $3s\ensuremath{\rightarrow}\mathrm{np}$ resonances were observed to change dramatically in appearance with increasing ionization along the Ar I sequence, and within the $3s\ensuremath{\rightarrow}\mathrm{np}$ channel of ${\mathrm{Ca}}^{2+}$. By applying the Dyson equation method to positive ions for the first time, newly investigated double-electron processes were shown to play a crucial role in the interpretation of the resonance structure. The changes within the resonances result from their position relative to the Cooper minima in the 3s and 3p photoabsorption.