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We present a Linearized Coupled Cluster (LCC) correction based on anAntisymmetric Product of 1 reference orbital Geminals (AP1roG) reference state.In our LCC ansatz, the cluster operator is restricted to double and to singleand double excitations as in standard single-reference CC theory. Theperformance of the AP1roG-LCC models is tested for the dissociation of diatomicmolecules (C$_2$ and F$_2$), spectroscopic constants of the uranyl cation(UO$_2^{2+}$), and the symmetric dissociation of the H$_{50}$ hydrogen chain.Our study indicates that an LCC correction based on an AP1roG referencefunction is more robust and reliable than corrections based on perturbationtheory, yielding spectroscopic constants that are in very good agreement withtheoretical reference data.

Linearized Coupled Cluster Correction on the Antisymmetric Product of 1 reference orbital Geminals