  Recently, several laser schemes have been proposed to separate racemic
mixtures of enantiomers by splitting a molecular beam into subbeams consisting
of molecules of definite chirality [Y. Li, C. Bruder, and C. P. Sun, Phys. Rev.
Lett. 99, 130403 (2007); X. Li and M. Shapiro, J. Chem. Phys. 132, 194315
(2010)]. These ideas rely on laser-induced effective gauge potentials in an
adiabatic basis which lead to a chirality dependent force on the
center-of-mass. However, the effect of molecular rotation has been neglected in
these studies. Accounting for the full molecular quantum state we find that the
potentials from the adiabatic dressed state approach cannot be recovered once
the molecular orientation dynamics is included, even in the rotational ground
state. This affects substantially the ability to perform enantioseparation in
the above mentioned setups.
