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The ground-state geometry of pyrrole¨Cwater£¨PWn £©. clusters was optimized at the restricted Hartree¨CFock £¨RHF£© level. Optimization of the 1¦Ð¦Ò* excited-state geometry was performed using the complete-active-space self-consistent-field £¨CASSCF£© method. The standard split-valence double zeta Gaussian basis set 6-31G** with polarization functions on all atoms was used. For the excited-state optimizations this basis set was supplemented with a set of s and p diffuse Gaussian functions localized at a floating center. The nuclear geometry of the cluster in the 1¦Ð¦Ò*) state £¨including the position of the floating center£© and the exponent of the s and p diffuse functions were optimized in a self-consistent manner until the energy change was below the threshold for optimization. A similar technique has been used in calculations of the dipole bound anions of molecular complexes.The active space for the CASSCF calculations includes all ¦Ð valence orbitals of the pyrrole ring and the ¦Ò* orbital. The active space thus correlates six electrons in six orbitals. Cs symmetry of the PWn Cluster was imposed in the course of the geometry optimization. Within the Cs point group the wave function of the 1¦Ð¦Ò* state transforms according to the non-totally symmetric A'' presentation and thus cannot collapse to the ground state. The geometry optimizations were performed with the GAMESS package. To incorporate electron-correlation effects for the excited states, single-point calculations at optimized geometries along the reaction path were performed with the aid of the CASPT2 method(second-order perturbation theory based on the CASSCF reference). The CASPT2 calculations were performed with the MOLCAS-4 package , using the ANO-L basis set of split-valence doublezeta quality with polarization functions on all atoms and diffuse s and p Gaussian functions at the floating center. ºìÉ«×ÖÌåµ½µ×ÊÇʲôÒâ˼£¿the exponent of the s and p diffuse functions Õâ¸öÖ¸ÊýÊÇָʲô¡£ |
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