掠入射原子-表面碰撞中的量子准共振
Quantum quasiresonances in grazing incident angle atom-surface collisions
摘要：
研究了原子与周期性表面碰撞中折射率方向法向分量之间的动量转移。对于掠入射的快原子，在折射率方向上存在一个方位角区间，在这个区间内能量转移非常有效。这种效应反映在量子衍射图案中，具有大的非镜面峰值，与平行于表面和垂直于折射率方向的动量分量相关联，并且可以用准共振来描述。虽然经典动力学不再现精确的量子衍射概率，表明这种效应的量子性质，经典和量子计算表明，准共振区域的跨度在两种动力学中一致，可以从相空间分析经典估计。
英文摘要：
The momentum transfer between the normal components to an index direction in the collision of an atom with a periodic surface is investigated. For fast atoms with grazing angle of incidence there is an interval of azimuthal angles around the index direction for which the energy transfer can be very efficient. This effect is reflected in quantum diffraction patterns with large non-specular peaks, associated with the parallel to the surface and normal to the index direction momentum component, and can be described in terms of quasiresonance. Although the classical dynamics does not reproduce the precise quantum diffraction probabilities, indicating the quantum nature of this effect, classical and quantum computations show that the span of the quasiresonance region coincides in both dynamics and can be classically estimated from the phase-space analysis.
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