  Coupled cluster methods are widely regarded as the gold standard of
computational quantum chemistry as they are perceived to offer the best
compromise between computational cost and a high-accuracy resolution of the
ground state eigenvalue of the electronic Hamiltonian -- an unbounded,
self-adjoint operator acting on a Hilbert space of antisymmetric functions that
describes electronic properties of molecular systems. The present contribution
is the second in a series of two articles where we introduce a new numerical
analysis of the single-reference coupled cluster method based on the
invertibility of coupled cluster Fr\'echet derivative. In this contribution, we
study discretisations of the single-reference coupled cluster equations based
on a prior mean-field (Hartree-Fock) calculation. We show that under some
structural assumptions on the associated discretisation spaces and assuming
that the discretisation is fine enough, the discrete coupled cluster equations
are locally well-posed, and we derive a priori and residual-based a posteriori
error estimates for the discrete coupled cluster solutions. Preliminary
numerical experiments indicate that the structural assumptions that we impose
for our analysis can be expected to hold for several small molecules and the
theoretical constants that appear in our error estimates are an improvement
over those obtained from earlier approaches.
