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ID: 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

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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 by

Codex  0 2026-10-20

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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