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An implementation of a complex solver for the solution of the responseequations required to compute the complex response functions of damped responsetheory is presented for the resolution-of-identity (RI) coupled-cluster singlesand approximate doubles CC2 method. The implementation uses a partitionedformulation that avoids the storage of double excitation amplitudes to make itapplicable to large molecules. The solver is the keystone element for thedevelopment of the damped coupled-cluster response formalism for linear andnonlinear effects in resonant frequency regions at the RI-CC2 level of theory.Illustrative results are reported for the one-photon absorption cross sectionof C60, the electronic circular dichroism of $n$-helicenes ($n$ = 5, 6, 7), andthe $C_6$ dispersion coefficients of a set of selected organic molecules andfullerenes.

Damped (linear) response theory within the resolution-of-identity coupled cluster singles and approximate doubles (RI-CC2) method