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Imaging quantum stereodynamics through Fraunhofer scattering of NO radicals with rare-gas atoms

机译:通过稀有气体原子的弗劳霍夫散射成像量子散射散射

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摘要

Stereodynamics describes how the vector properties of molecules, such as the directions in which they move and the axes about which they rotate, affect the probabilities (or cross-sections) of specific processes or transitions that occur on collision. The main aspects of stereodynamics in inelastic atom–molecule collisions can often be understood from classical considerations, in which the particles are represented by billiard-ball-like hard objects. In a quantum picture, however, the collision is described in terms of matter waves, which can also scatter into the region of the geometrical shadow of the object and reveal detailed information on the pure quantum-mechanical contribution to the stereodynamics. Here we present measurements of irregular diffraction patterns for NO radicals colliding with rare-gas atoms that can be explained by the analytical Fraunhofer model. They reveal a hitherto overlooked dependence on (or ‘propensity rule’ for) the magnetic quantum number m of the molecules, and a previously unrecognized type of quantum stereodynamics that has no classical analogue or interpretation.
机译:立体动力学描述了分子的载体特性如何,例如它们移动的方向和它们旋转的轴线,影响碰撞时发生的特定过程或过渡的概率(或横截面)。从经典的考虑中通常可以理解无弹性原子分子碰撞中的立体动力学的主要方面,其中颗粒由台球状硬物表示。然而,在量子图像中,在物质波方面描述碰撞,其也可以散射到物体的几何阴影区域中,并揭示关于对立体动力学的纯量子机械贡献的详细信息。在这里,我们对不含稀气原子碰撞的非基团的不规则衍射图案的测量结果可以通过分析弗劳诺的模型解释。它们揭示了迄今为止忽视的(或'倾向规则')磁量子数m的偏见依赖性,以及先前未被识别的量子态度类型,其没有经典的类似物或解释。

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