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CONTENTS<br />

xxiii<br />

34.7.8 DESCRIPTION — user defined description . . . . . . . . . . . . . . . 267<br />

34.7.9 Format of cube file . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267<br />

34.8 GOPENMOL — calculate grids for visualization in gOpenMol . . . . . . . . . 267<br />

35 RELATIVISTIC CORRECTIONS 268<br />

35.1 Using the Douglas–Kroll–Hess Hamiltonian . . . . . . . . . . . . . . . . . . . 268<br />

35.2 Example for computing relativistic corrections . . . . . . . . . . . . . . . . . . 269<br />

36 DIABATIC ORBITALS 269<br />

37 NON ADIABATIC COUPLING MATRIX ELEMENTS 271<br />

37.1 The DDR procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271<br />

38 QUASI-DIABATIZATION 274<br />

39 THE VB PROGRAM CASVB 280<br />

39.1 Structure of the input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280<br />

39.2 Defining the CASSCF wavefunction . . . . . . . . . . . . . . . . . . . . . . . 281<br />

39.2.1 The VBDUMP directive . . . . . . . . . . . . . . . . . . . . . . . . . 281<br />

39.3 Other wavefunction directives . . . . . . . . . . . . . . . . . . . . . . . . . . 281<br />

39.4 Defining the valence bond wavefunction . . . . . . . . . . . . . . . . . . . . . 281<br />

39.4.1 Specifying orbital configurations . . . . . . . . . . . . . . . . . . . . . 281<br />

39.4.2 Selecting the spin basis . . . . . . . . . . . . . . . . . . . . . . . . . . 282<br />

39.5 Recovering CASSCF CI vector and VB wavefunction . . . . . . . . . . . . . . 282<br />

39.6 Saving the VB wavefunction . . . . . . . . . . . . . . . . . . . . . . . . . . . 282<br />

39.7 Specifying a guess . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283<br />

39.7.1 Orbital guess . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283<br />

39.7.2 Guess for structure coefficients . . . . . . . . . . . . . . . . . . . . . . 283<br />

39.7.3 Read orbitals or structure coefficients . . . . . . . . . . . . . . . . . . 283<br />

39.8 Permuting orbitals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284<br />

39.9 Optimization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284<br />

39.9.1 Optimization criterion . . . . . . . . . . . . . . . . . . . . . . . . . . 284<br />

39.9.2 Number of iterations . . . . . . . . . . . . . . . . . . . . . . . . . . . 284<br />

39.9.3 CASSCF-projected structure coefficients . . . . . . . . . . . . . . . . 284<br />

39.9.4 Saddle-point optimization . . . . . . . . . . . . . . . . . . . . . . . . 284<br />

39.9.5 Defining several optimizations . . . . . . . . . . . . . . . . . . . . . . 285<br />

39.9.6 Multi-step optimization . . . . . . . . . . . . . . . . . . . . . . . . . . 285

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