Larsen JJ, Hald K, Bjerre N, Stapelfeldt H, Seideman T
Institute of Physics and Astronomy, University of Arhus, DK-8000 Arhus C, Denmark.
Phys Rev Lett. 2000 Sep 18;85(12):2470-3. doi: 10.1103/PhysRevLett.85.2470.
We demonstrate, theoretically and experimentally, that an intense, elliptically polarized, nonresonant laser field can simultaneously force all three axes of a molecule to align along given axes fixed in space, thus inhibiting the free rotation in all three Euler angles. Theoretically, the effect is illustrated through time dependent quantum mechanical calculations. Experimentally, 3, 4-dibromothiophene molecules are aligned with a nanosecond laser pulse. The alignment is probed by 2D ion imaging of the fragments from a 20 fs laser pulse induced Coulomb explosion.
我们在理论和实验上证明，一个强的、椭圆偏振的、非共振激光场能够同时迫使分子的所有三个轴沿着固定在空间中的给定轴排列，从而抑制所有三个欧拉角的自由旋转。从理论上讲，通过含时量子力学计算来说明这种效应。在实验中，用纳秒激光脉冲使3,4 - 二溴噻吩分子排列。通过对20飞秒激光脉冲诱导的库仑爆炸产生的碎片进行二维离子成像来探测这种排列。
