Reduced Density Operators, Their Related von Neumann Density Operators, Close Cousins of These, and their Physical Interpretation

摘要: The (N-l)- and (N-2)-electron reduced density operators of a pure stationary state many electron system (such as the electronic structure an atom or molecule) can be realized idealization statistical von Neumann operator ion formed from that in appropriate sudden ionization experiment. N-electron Hermitian whose matrix representation is Garrod Percus G-Matrix (the metric particle-hole states given state) excitation-related part this via random impulsive particle-conserving perturbation. Comparison these with those obtained specified perturbations allows discrimination between responses which depend strongly upon excitation mechanism are characteristic only weakly dependent on mechanism.