Abstract
The wave function of Coulson and Fischer is examined within the context of recent developments in quantum chemistry. It is argued that the Coulson–Fischer ansatz establishes a ‘third way’ in quantum chemistry, which should not be confused with the traditional molecular orbital and valence bond formalisms. The Coulson–Fischer theory is compared with ‘modern’ valence bond approaches and also modern multireference correlation methods. Because of the non-orthogonality problem which arises when wave functions are constructed from arbitrary orbital products, the application of the Coulson–Fischer method to larger molecules necessitates the introduction of approximation schemes. It is shown that the use of hierarchical orthogonality restrictions has advantages, combining a picture of molecular electronic structure which is an accord with simple, but nevertheless empirical, ideas and concepts, with a level of computational complexity which renders practical applications to larger molecules tractable. An open collaborative virtual environment is proposed to foster further development.
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Wilson, S. (2009). On the Wave Function of Coulson and Fischer: A Third Way in Quantum Chemistry. In: Piecuch, P., Maruani, J., Delgado-Barrio, G., Wilson, S. (eds) Advances in the Theory of Atomic and Molecular Systems. Progress in Theoretical Chemistry and Physics, vol 19. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2596-8_13
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