V: J

This can also be written as a matrix equation.

This can also be written as a matrix equation.

Solving the secular equations is equivalent to diagonalizing the CI matrix (see Section 16.2.4). The CI energy is obtained as the lowest eigenvalue of the CI matrix, and the corresponding eigenvector contains the ai coefficients in front of the determinants in eq. (4.2). The second lowest eigenvalue corresponds to the first excited state, etc.

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