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A refined alternant molecular orbital (AMO) method is described in which we allow for different variable parameters for each MO pair which is coupled. A corresponding many-parameter energy expression for the ground state of an arbitrary system with closed-shell structure is derived. Results of a numerical analysis involving the pi-electron sextet in benzene are briefly reviewed. Possible future applications of this scheme are suggested.
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J. de Heer (1962) studied this question.
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