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CONTENTS<br />

xviii<br />

20.4 Miscellaneous thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159<br />

20.5 Print options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160<br />

20.6 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162<br />

20.7 Cluster corrections for multi-state MRCI . . . . . . . . . . . . . . . . . . . . . 163<br />

21 MULTIREFERENCE RAYLEIGH SCHRÖDINGER PERTURBATION THEORY165<br />

21.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166<br />

21.2 Excited state calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167<br />

21.3 Multi-State CASPT2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167<br />

21.3.1 Performing SS-SR-CASPT2 calculations . . . . . . . . . . . . . . . . 168<br />

21.3.2 Performing MS-MR-CASPT2 calculations . . . . . . . . . . . . . . . 170<br />

21.4 Modified Fock-operators in the zeroth-order Hamiltonian. . . . . . . . . . . . . 171<br />

21.5 Level shifts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171<br />

21.6 Integral direct calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172<br />

21.7 CASPT2 gradients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172<br />

21.8 Coupling MRCI and MRPT2: The CIPT2 method . . . . . . . . . . . . . . . . 175<br />

21.9 Further options for CASPT2 and CASPT3 . . . . . . . . . . . . . . . . . . . . 175<br />

22 NEVPT2 calculations 176<br />

22.1 General considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176<br />

22.2 Input description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177<br />

23 MØLLER PLESSET PERTURBATION THEORY 178<br />

23.1 Expectation values for MP2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179<br />

23.2 Polarizabilities and second-order properties for MP2 . . . . . . . . . . . . . . 179<br />

23.3 CPHF for gradients, expectation values and polarizabilities . . . . . . . . . . . 179<br />

23.4 Density-fitting MP2 (DF-MP2, RI-MP2) . . . . . . . . . . . . . . . . . . . . . 180<br />

23.5 Spin-component scaled MP2 (SCS-MP2) . . . . . . . . . . . . . . . . . . . . 180<br />

24 THE CLOSED SHELL CCSD PROGRAM 182<br />

24.1 Coupled-cluster, CCSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182<br />

24.2 Quadratic configuration interaction, QCI . . . . . . . . . . . . . . . . . . . . . 183<br />

24.3 Brueckner coupled-cluster calculations, BCCD . . . . . . . . . . . . . . . . . 183<br />

24.3.1 The BRUECKNER directive . . . . . . . . . . . . . . . . . . . . . . . . 183<br />

24.4 Singles-doubles configuration interaction, CISD . . . . . . . . . . . . . . . . . 184<br />

24.5 The DIIS directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184<br />

24.6 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

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