快Ne原子在LiF（001）表面吸引阱中的折射
Refraction of fast Ne atoms in the attractive well of LiF(001) surface
摘要：
能量高达3 keV的Ne原子在掠入射角下从LiF（001）表面衍射。对于一个小的动量分量的入射光束垂直于表面，我们观察到的弹性彩虹角的增加与非弹性散射分布的加宽。我们将这两种效应解释为原子波在表面势吸引部分的折射。我们使用一个快速，严格的动态衍射计算，找到一个投射表面势模型，使实验数据的定量再现多达10个衍射级。这使我们能够提取一个有吸引力的潜在的深度为10.4毫电子伏。我们的研究结果为更精细的表面势模型设定了基准，其中包括弱范德华区域，这是原子-表面相互作用研究中的一个长期挑战。
英文摘要：
Ne atoms with energies up to 3 keV are diffracted under grazing angles of incidence from a LiF(001) surface. For a small momentum component of the incident beam perpendicular to the surface, we observe an increase of the elastic rainbow angle together with a broadening of the inelastic scattering profile. We interpret these two effects as the refraction of the atomic wave in the attractive part of the surface potential. We use a fast, rigorous dynamical diffraction calculation to find a projectile-surface potential model that enables a quantitative reproduction of the experimental data for up to ten diffraction orders. This allows us to extract an attractive potential well depth of 10.4 meV. Our results set a benchmark for more refined surface potential models which include the weak Van der Waals region, a long-standing challenge in the study of atom-surface interactions.
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