Laser Induced Selective Alignment of Water Spin Isomers
  We consider laser alignment of ortho and para spin isomers of water molecules by using strong and short off-resonance laser pulses. A single pulse is found to create a distinct transient alignment and antialignment of the isomeric species. We suggest selective alignment of one isomeric species (leaving the other species randomly aligned) by a pair of two laser pulses. 
E. Gershnabel and I.Sh. Averbukh