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CONTENTS<br />

xvi<br />

19.5.1 Defining the starting guess . . . . . . . . . . . . . . . . . . . . . . . . 135<br />

19.5.2 Rotating pairs of initial orbitals . . . . . . . . . . . . . . . . . . . . . 135<br />

19.5.3 Saving the final orbitals . . . . . . . . . . . . . . . . . . . . . . . . . 135<br />

19.5.4 Saving the CI vectors and information for a gradient calculation . . . . 136<br />

19.5.5 Natural orbitals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136<br />

19.5.6 Pseudo-canonical orbitals . . . . . . . . . . . . . . . . . . . . . . . . 137<br />

19.5.7 Localized orbitals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137<br />

19.5.8 Diabatic orbitals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137<br />

19.6 Selecting the optimization methods . . . . . . . . . . . . . . . . . . . . . . . . 139<br />

19.6.1 Selecting the CI method . . . . . . . . . . . . . . . . . . . . . . . . . 139<br />

19.6.2 Selecting the orbital optimization method . . . . . . . . . . . . . . . . 140<br />

19.6.3 Disabling the optimization . . . . . . . . . . . . . . . . . . . . . . . . 140<br />

19.6.4 Disabling the extra symmetry mechanism . . . . . . . . . . . . . . . . 140<br />

19.7 Calculating expectation values . . . . . . . . . . . . . . . . . . . . . . . . . . 141<br />

19.7.1 Matrix elements over one-electron operators . . . . . . . . . . . . . . . 141<br />

19.7.2 Matrix elements over two-electron operators . . . . . . . . . . . . . . 141<br />

19.7.3 Saving the density matrix . . . . . . . . . . . . . . . . . . . . . . . . . 141<br />

19.8 Miscellaneous options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141<br />

19.8.1 Print options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142<br />

19.8.2 Convergence thresholds . . . . . . . . . . . . . . . . . . . . . . . . . 142<br />

19.8.3 Maximum number of iterations . . . . . . . . . . . . . . . . . . . . . 143<br />

19.8.4 Test options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143<br />

19.8.5 Special optimization parameters . . . . . . . . . . . . . . . . . . . . . 143<br />

19.8.6 Saving wavefunction information for CASVB . . . . . . . . . . . . . . 144<br />

19.8.7 Saving transformed integrals . . . . . . . . . . . . . . . . . . . . . . . 144<br />

19.9 Coupled-perturbed MCSCF . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144<br />

19.9.1 Gradients for SA-MCSCF . . . . . . . . . . . . . . . . . . . . . . . . 145<br />

19.9.2 Difference gradients for SA-MCSCF . . . . . . . . . . . . . . . . . . 145<br />

19.9.3 Non-adiabatic coupling matrix elements for SA-MCSCF . . . . . . . . 145<br />

19.9.4 MCSCF hessians . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146<br />

19.10Optimizing valence bond wavefunctions . . . . . . . . . . . . . . . . . . . . . 146<br />

19.11Hints and strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146<br />

19.12Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

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