  We derive general conditions for the emergence of singlet Feshbach molecules
in the presence of artificial Zeeman fields for arbritary mixtures of Rashba
and Dresselhaus spin-orbit orbit coupling in two or three dimensions. We focus
on the formation of two-particle bound states resulting from interactions
between ultra-cold spin-1/2 fermions, under the assumption that interactions
are short-ranged and occur only in the s-wave channel. In this case, we
calculate explicitly binding energies of Feshbach molecules and analyze their
dependence on spin-orbit couplings, Zeeman fields, interactions and center of
mass momentum, paying particular attention to the experimentally relevant case
of spin-orbit couplings with equal Rashba and Dresselhaus (ERD) amplitudes.
