快原子衍射的半量子方法：解决彩虹发散
Semi-quantum approach for fast atom diffraction: solving the rainbow divergence
摘要：
在这项工作中，我们介绍了一种扭曲波的方法，基于量子演化算子的初值表示（IVR）的方法，以提高半经典描述的彩虹效应产生的掠射散射的快原子从晶体表面的衍射图案。本文将表面初值表示（SIVR）理论应用于He原子与LiF（001）表面沿低折射率晶体沟道的碰撞。对于这个碰撞系统的SIVR方法提供了一个很好的表示实验弹丸分布的量子干涉结构，即使在角区域周围的经典彩虹角常见的半经典方法发散。
英文摘要：
In this work we introduce a distorted wave method, based on the Initial Value Representation (IVR) approach of the quantum evolution operator, in order to improve the semiclassical description of rainbow effects in diffraction patterns produced by grazing scattering of fast atoms from crystal surfaces. The proposed theory, named Surface Initial Value Representation (SIVR) approximation, is applied to He atoms colliding with a LiF(001) surface along low indexed crystallographic channels. For this collision system the SIVR approach provides a very good representation of the quantum interference structures of experimental projectile distributions, even in the angular region around classical rainbow angles where common semiclassical methods diverge.
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