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    Perturbational Self-Consistent Orbitals for Open-Shell Systems. An Applicatlon to Xylylenes

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    An extension of the Lefebvre-Daudey method of building self- consistent localized MO's for closed-shell systems by use of the perturbation theory is given for open-shell systems. By avoiding the eigenvalue problem, and then the diagonalization process, a convenient set of SCF MO's is build so that the results of the Configuration Interaction calculations can be qualitatively understood from a chemical point of view. An application to the orthometa- and para-xylylenes is given
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