| A new local method for calculation of transition strength and first-order properties of excited states in extended molecular systems is presented. It is based on the local CC2 method for calculating the electronic excitation energies of singlet states. As before, the single excitations are treated non-locally and local restrictions are imposed on doubles amplitudes only. The Density-Fitting approximation for Electron Repulsion Integrals is utilized. A procedure to determine the orbital domains based on solutions of CPHF/CPL equations and a semi-local CC2 method for excited-state domain construction has also been developed and implemented. |
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