title: Selective alignment of molecular spin isomers.
abstract: We experimentally demonstrate field-free, spin-selective alignment of ortho- and para molecular spin isomers at room temperature. By means of two nonresonant, strong, properly delayed femtosecond pulses within a four wave mixing arrangement, we observed selective alignment for homonuclear diatomics composed of spin 1/2 (15N) or spin 1 (14N) atoms. The achieved selective control of the isomers' angular distribution and rotational excitation may find applications to analysis, enrichment, and actual physical separation of molecular spin modifications.
authors.affiliation: Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Sharly
authors.initials: S
authors.lastname: Fleischer
authors.forename: Ilya Sh
authors.initials: ISh
authors.lastname: Averbukh
authors.forename: Yehiam
authors.initials: Y
authors.lastname: Prior