  We theoretically examine Raman photoassociation of a Bose-Einstein
condensate, revisiting stimulated Raman adiabatic passage (STIRAP). Due to
collisional mean-field shifts, efficient molecular conversion requires strong
coupling and low density, either of which can bring about rogue
photodissociation to noncondensate modes. We demonstrate explicitly that rogue
transitions are negligible for low excited-state fractions and
photodissociation that is slower than the STIRAP timescale. Moreover, we derive
a reduced-parameter model of collisions, and thereby find that a gain in the
molecular conversion efficiency can be obtained by adjusting the atom-atom
scattering length with off-resonant magnetoassociation. This gain saturates
when the atom-atom scattering length is tuned to a specific fraction of either
the molecule-molecule or atom-molecule scattering length. We conclude that a
fully-optimized STIRAP scheme may offer the best chance for achieving coherent
conversion from an atomic to a molecular condensate with photoassociation.
