Spatio-Temporal Symmetries of Electronic Chirality Flips in Oriented RbCs Induced by two Coincident Laser Pulses with Circular ++, +-, -+, -- Polarizations.

Abstract

Recently it has been shown that two coincident well designed laser pulses with two different combinations of circular polarizations ( $++$ or $-+$ ) can create chiral electronic densities in an oriented heteronuclear diatomic molecule. Subsequently, the chirality flips from the electronic R_a to S_a to R_a to S_a etc. enantiomers, with periods in the femtosecond (fs) and attosecond (as) time domains. The results were obtained by means of quantum dynamics simulations for oriented NaK. Here we investigate the electronic chirality flips in oriented RbCs induced by all possible ( $++$ , $-+$ , $+-$ , $--$ ) combinations of circular polarizations of two coincident well-designed laser pulses. Accordingly, the $++$ and $--$ as well as the $+-$ and $-+$ combinations generate opposite electronic enantiomers, e. g. R_a versus S_a, followed by opposite periodic chirality flips, e. g. from R_a to S_a to R_a to S_a etc. versus from S_a to R_a to S_a to R_a etc, with periods in the fs and as time domains, respectively. The laser induced spatio-temporal symmetries are derived from first principles and illustrated by quantum dynamics simulations.