Kim Lee Yeong, Jin Byung Gwun, Kim Tae Woo, Lee Ju Hyeon, Zhao Bum Suk
Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, Korea.
Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, Korea.
Sci Adv. 2020 Apr 3;6(14):eaaz0682. doi: 10.1126/sciadv.aaz0682. eCollection 2020 Apr.
We study the effect of rotational state-dependent alignment in the scattering of molecules by optical fields. CS molecules in their lowest few rotational states are adiabatically aligned and transversely accelerated by a nonresonant optical standing wave. The width of the measured transverse velocity distribution increases to 160 m/s with the field intensity, while its central peak position moves from 10 to -10 m/s. These changes are well reproduced by numerical simulations based on the rotational state-dependent alignment but cannot be modeled when ignoring these effects. Moreover, the molecular scattering by an off-resonant optical field amounts to manipulating the translational motion of molecules in a rotational state-specific way. Conversely, our results demonstrate that scattering from a nonresonant optical standing wave is a viable method for rotational state selection of nonpolar molecules.
我们研究了分子在光场散射中旋转态相关取向的影响。处于最低几个旋转态的CS分子通过非共振光学驻波被绝热取向并横向加速。测量的横向速度分布宽度随场强增加到160米/秒，而其中心峰值位置从10米/秒移动到 -10米/秒。基于旋转态相关取向的数值模拟很好地再现了这些变化，但忽略这些效应时无法进行建模。此外，非共振光场引起的分子散射相当于以旋转态特定的方式操纵分子的平动。相反，我们的结果表明，非共振光学驻波的散射是选择非极性分子旋转态的一种可行方法。
