Orientation of molecules via laser-induced anti-alignment
  We show that field-free molecular orientation induced by a half-cycle pulse may be considerably enhanced by an additional laser pulse inducing molecular anti-alignment. Two qualitatively different enhancement mechanisms are identified depending on the pulse order, and their effects are optimized with the help of quasi-classical as well as fully quantum models. 
E. Gershnabel (1), I. Sh. Averbukh (1), R.J. Gordon (2) ((1) Dept. of   Chemical Physics, The Weizmann Institute of Science,...