Abstract
An approach to the many-electron problem is reviewed which, apart from being practical and general, essentially addresses the “basis set problem”. It puts emphasis on the separate and appropriate choice and optimization of the function spaces describing the zeroth order and the remaining part of the N-electron wavefunction, especially in excited states. The calculated wavefunctions are compact and physically transparent while the results for properties which are obtained from them are reliable. The characteristic numerical examples which are given cover a wide spectrum: the importance of higher than pair subshell correlation clusters in certain excited states, (triple excitations in Cl KL3s3p6 2S), positions of resonances and autoionizing states in He- and He, the “sudden polarization effect” in ethylene, the transition probabilities to the valence-Rydberg 2S series of boron, the second-order perturbation theory calculation of electron correlation in CH4, the ls binding energies in atomic as well as in metallic Be, and the Hartree-Fock calculation of transition probabilities to multiply excited states and of the binding of the first excited state of the noble gas dihydrides, HeH2, NeH2 and ArH2.
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Nicolaides, C.A. (1984). State-Specific Theory of Electron Correlation in Excited States. In: Dykstra, C.E. (eds) Advanced Theories and Computational Approaches to the Electronic Structure of Molecules. NATO ASI Series, vol 133. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6451-8_9
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DOI: https://doi.org/10.1007/978-94-009-6451-8_9
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