Field-free Three-Dimensional Orientation of Asymmetric-Top Molecules

摘要: Alignment and orientation of molecules by intense, ultrashort laser fields are crucial for a variety applications in physics chemistry. These include control high harmonics generation, molecular orbitals tomography, photoionization dissociation processes, production "molecular movies" with the help X-ray free-electron sources ultrafast electron diffraction relativistic electrons. While dynamics laser-induced alignment has been extensively studied demonstrated, is much more challenging task, especially asymmetric-top molecules. Here we report first experimental demonstration field-free, all-optical three-dimensional means phase-locked cross-polarized two-color pulses. In addition to conventional integrated factor, differential degree which not amenable optical measurements, but readily accessible our angle-resolved imaging technique. Our scheme applies wide class asymmetric opens new ways towards controlling their orientation, eventually leading direct structure gas-phase using advanced free beams extremely spatiotemporal resolution.