Excitation Energies and Transition Moments from the Polarization Propagator
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These lectures will be concerned with the principles behind an algebraic, equation of motion approach to the determination of the polarization propagator. This term is here taken in a general sense to encompass a set of two-time Green’s functions, such as used by Yngve Öhrn and the present author in our textbook , There will not be time to present the arguments leading to the appearance of the polarization propagator as the natural quantity for the examination of transition moments and excitation energies, and the concerned reader may find a detailed approach in terms of photon scattering in Chapter 12 of Reference .
KeywordsExcitation Energy Random Phase Approximation Transition Moment Spectral Density Function Propagator Calculation
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