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

通过在弱静电场中分别快速关闭线性偏振和椭圆偏振激光场，实现了无激光场的状态选择不对称顶部分子的一维和三维取向。在强非共振双色激光场的全光分子定向原理验证实验成功后，状态选择分子获得了更高程度的分子定向。通过等离子体快门技术快速关闭强非共振双色激光场，可以实现完全无场的分子定向。另一方面，通过观察载波包络相稳定飞秒脉冲在排列分子中产生的高次谐波的强度和相谱，获得了各种新的发现。发展了最先进、最精密的分子成像技术，成功开启了“分子中的电子立体动力学”研究。

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.