Diffraction of fast atoms and molecules from surfaces
Diffraction of fast atoms and molecules from surfaces
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快速原子和分子从表面的衍射
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Philippe Roncin
中科院分区：
文献类型：
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作者：
J. Manson;H. Khemliche;Philippe Roncin
在最近实验进展的推动下，发展了快原子掠入射的表面散射理论。该理论提出了有序表面的量子力学极限，该极限描述了相干衍射峰，其热衰减由德拜-沃勒因子控制，然而，该德拜-沃勒因子的值远大于使用简单模型计算的值。在高能量和高温度下获得了非相干散射的经典极限。在这些限制的经典情况和量子情况之间存在另一种情况，其中出现的衍射特征因散射光束快速方向上的运动而变宽，但其强度不受德拜-沃勒因子控制。所有这些限制似乎都可以在当前可用的实验条件范围内实现。
Prompted by recent experimental developments, a theory of surface scattering of fast atoms at grazing incidence is developed. The theory gives rise to a quantum mechanical limit for ordered surfaces that describes coherent diffraction peaks whose thermal attenuation is governed by a Debye-Waller factor, however, this Debye-Waller factor has values much larger than would be calculated using simple models. A classical limit for incoherent scattering is obtained for high energies and temperatures. Between these limiting classical and quantum cases is another regime in which diffraction features appear that are broadened by the motion in the fast direction of the scattered beam but whose intensity is not governed by a Debye-Waller factor. All of these limits appear to be accessible within the range of currently available experimental conditions.