Theory of a two-step enantiomeric purification of racemic mixtures by optical means: The D_2S_2 molecule

摘要

We present an optical "enantio-purification switch" that turns in two steps a racemic mixture of left-handed and right-handed chiral molecules into a pure sample containing the enantiomer of interest.The optical switch is composed of an "enantio discriminator" and an "enantio converter" actig in tandem. The method is robust, insensitive to decay processes, and does not require molecular preorientation. We demonstrate the method for the nanosecond purification of a reacemate of (transiently chiral) D_2S_2 molecules. The energies of the rovibrational states and the related dipole elements are obtained by ab initio calculations.