Isotopic effects on the control of molecular handedness of H2POSH by ultrashort laser pulses

The selective preparation of an enantiomer starting from a pure state of H2 POSH representing a 50%:50% mixture of two enantiomers with opposite chiral ities is extended to its deuterated counterpart, H2POSD. A one-dimensional model involving the torsional angle of S-H/D around a pre-oriented P-S axis is used. The design of an appropriate sequence of ultrashort infrared lase r pulses to achieve molecular handedness for H2POSH/D is based on the chara cteristic level splitting and tunneling times of both molecules. A simple s cheme of two linearly polarized laser pulses involving a three level system serves to convert the different isotopomers to opposite enantiomers, for a ny given mixture of H2POSH and H2POSD molecules.