Enantioselective chiral orientation induced by a combination of a long and a short laser pulse

Enantioselective orientation of chiral molecules excited by a shaped picosecond laser pulse and a delayed femtosecond pulse is considered. Using quantum-mechanical simulations, we demonstrate a strong field-free enantioselective orientation along the laser propagation direction. In addition, we use a classical model to reproduce the enantioselective orientation. Moreover, the analysis of the corresponding classical system allows understanding the qualitative features of the induced enantioselective orientation. The strong enantioselective orientation may be used for the separation of chiral enantiomers using inhomogeneous electrostatic fields.