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Quantum reflection
Quantum reflection is a physical phenomenon involving the reflection of a matter wave from an attractive potential. In classical mechanics, such a phenomenon is not possible; for instance when one magnet is pulled toward another, the observer does not expect one of the magnets to suddenly (i.e. before the magnets 'touch') turn around and retreat in the opposite direction.
==Definition==
Quantum reflection became an important branch of physics in the 21st century. In a workshop about quantum reflection,〔Quantum Reflection, workshop; October 22–24, 2007, Cambridge, Massachusetts, USA; http://cfa-www.harvard.edu/itamp/QuantumReflection.html
〕 the following definition of quantum reflection was suggested:
Quantum reflection is a classically counterintuitive phenomenon whereby the motion of particles is reverted "against the force" acting on them. This effect manifests the wave nature of particles and influences collisions of ultracold atoms and interaction of atoms with solid surfaces.
Observation of quantum reflection has become possible thanks to recent advances in trapping and cooling atoms.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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