  We present a Linearized Coupled Cluster (LCC) correction based on an
Antisymmetric Product of 1 reference orbital Geminals (AP1roG) reference state.
In our LCC ansatz, the cluster operator is restricted to double and to single
and double excitations as in standard single-reference CC theory. The
performance of the AP1roG-LCC models is tested for the dissociation of diatomic
molecules (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 reference
function is more robust and reliable than corrections based on perturbation
theory, yielding spectroscopic constants that are in very good agreement with
theoretical reference data.
