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We present a general embedding theory of electronic excitations of arelatively small, localized system in contact with an extended, chemicallycomplex environment. We demonstrate how to include the screening response ofthe environment into highly accurate electronic structure calculation of thelocalized system by means of an effective interaction between the electrons,which contains only screening processes occurring in the environment. For thecommon case of a localized system which constitutes an inhomogeneity in anotherwise homogeneous system, such as a defect in a crystal, we show how matrixelements of the environment-screened interaction can be calculated fromdensity-functional calculations of the homogeneous system only. We apply ourembedding theory to the calculation of excitation energies in crystallineethylene.

Embedding theory for excited states with inclusion of self-consistent environment screening