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- W1963526934 abstract "The projection operator method of Zwanzig and Feshbach is used to construct the time dependent density operator associated with a binary scattering event. The formula developed to describe this time dependence involves time-ordered cosine and sine projected evolution (memory) superoperators. Both Sehrödinger and interaction picture results are presented. The former is used to demonstrate the equivalence of the time dependent solution of the von Neumann equation and the more familiar, frequency dependent Laplaee transform solution. For two particular classes of projection superoperators projected density operators arc shown to be equivalent to projected wave functions. Except for these two special eases, no projected wave function analogs of projected density operators exist. Along with the decoupled-motions approximation, projected interaction picture density operators arc applied to inelastic scattering events. Simple illustrations arc provided of how this formalism is related to previously established results for two-state processes, namely, the theory of resonant transfer events, the first order Magnus approximation, and the Landau–Zener theory." @default.
- W1963526934 created "2016-06-24" @default.
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- W1963526934 date "1982-10-01" @default.
- W1963526934 modified "2023-09-23" @default.
- W1963526934 title "Projected evolution superoperators and the density operator: theory and applications to inelastic scattering" @default.
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- W1963526934 doi "https://doi.org/10.1139/p82-185" @default.
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