Dramatic changes in the 3s autoionization process at the beginning of the Ar I sequence
van Kampen, Paul and O’Sullivan, G. and Ivanov, V. and Ipatov, A. and Costello, John T. and Kennedy, Eugene T. (1997) Dramatic changes in the 3s autoionization process at the beginning of the Ar I sequence. Physical Review Letters, 78 (16). pp. 3082-3085. ISSN 0031-9007
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The 3s→np resonances were observed to change dramatically in appearance with increasing ionization along the Ar I sequence, and within the 3s→np channel of Ca2+. 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.
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