Electronic stereodynamics in molecules and ultrafast molecular imaging based on molecular orientation techniques

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Laser-field-free one- and three-dimensional orientation of state-selected asymmetric top molecules has been achieved by rapidly turning off a linearly- and elliptically-polarized laser field, respectively, in a weak electrostatic field. After the success of the proof-of-principle experiment of all-optical molecular orientation with an intense nonresonant two-color laser field, higher degrees of molecular orientation have been achieved with state-selected molecules. Completely field-free molecular orientation can be achieved by rapidly turning off an intense nonresonant two-color laser field with the plasma shutter technique. On the other hand, various new findings have been obtained by observing both intensity and phase spectra of high-order harmonics generated in aligned molecules with carrier-envelope-phase-stabilized femtosecond pulses. The most advanced and sophisticated molecular imaging technique has been developed and the studies on “electronic stereodynamics in molecules” have been successfully opened.