Second-order Moller-Plesset analytical derivatives for the polarizable continuum model using the relaxed density approach

We present a method for evaluating second-order Moller-Plesset (MP2) energy and gradients for solvated molecules described within the polarizable cont inuum model (PCM). The explicit inclusion of solvent effects into the evalu ation of the relaxed MP2 density through the Z-vector technique is reported and analyzed. Applications to some one-electron response properties (dipol es, electrostatic molecular potentials, electric field gradients) as well a s nuclear gradients are presented.