Past exam of the chemistry course of the year 3 of the natural sciences course of the University of Cambridge / 2022 / Paper 2A / Section A / 19 / a / i / Solution 2026-10-20
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configuration interaction with singles and doubles (CISD) uses a linear combination of the reference Slater determinant and singly and doubly excited determinants. Its many-electron trial state is therefore not restricted to one determinant; the orbitals may be held fixed while the configuration coefficients are varied.
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