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- W2030080922 abstract "We show that a theory that neglects dynamic correlation in ion-atom collisions (the {ital frozen correlation approximation}, FCA) is able to provide accurate multiple-excitation cross sections from one-electron amplitudes. Important requirements for the success of the FCA are (i) inclusion of correlation in both the initial and final states, and (ii) inclusion of screening effects during the collision. We find an excellent agreement between fully correlated and FCA results for double excitation of He by bare ions, thus showing that the FCA can be efficiently used in the evaluation of multiple-excitation cross sections when fully correlated calculations are not accessible. {copyright} {ital 1997} {ital The American Physical Society}" @default.
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- W2030080922 date "1997-03-01" @default.
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- W2030080922 title "Accurate evaluation of multiple-excitation cross sections from one-electron amplitudes" @default.
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