Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.
Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1.
Nat Commun. 2017 May 8;8:15357. doi: 10.1038/ncomms15357.
The outcome of molecule-surface collisions can be modified by pre-aligning the molecule; however, experiments accomplishing this are rare because of the difficulty of preparing molecules in aligned quantum states. Here we present a general solution to this problem based on magnetic manipulation of the rotational magnetic moment of the incident molecule. We apply the technique to the scattering of H from flat and stepped copper surfaces. We demonstrate control of the molecule's initial quantum state, allowing a direct comparison of differences in the stereodynamic scattering from the two surfaces. Our results show that a stepped surface exhibits a much larger dependence of the corrugation of the interaction on the alignment of the molecule than the low-index surface. We also demonstrate an extension of the technique that transforms the set-up into an interferometer, which is sensitive to molecular quantum states both before and after the scattering event.
分子-表面碰撞的结果可以通过预先对准分子来改变；然而，由于难以制备处于对准量子态的分子，实现这一目标的实验很少。在这里，我们基于入射分子的旋转磁矩的磁操控提出了这个问题的通用解决方案。我们将该技术应用于 H 从平面和阶梯状铜表面的散射。我们演示了对分子初始量子态的控制，允许直接比较从两个表面散射的立体动力学差异。我们的结果表明，阶梯状表面的相互作用的波纹对分子对准的依赖性比低指数表面大得多。我们还展示了该技术的扩展，将该装置转换为干涉仪，该干涉仪对散射事件前后的分子量子态都敏感。
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