low-energy positron diffraction
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low-energy positron diffraction[′lō ‚en·ər·jē ′päz·ə‚trän di‚frak·shən]
A technique for studying the atomic structure of solid surfaces in which a narrow beam of low-energy monoenergetic positrons is made to strike a solid surface, and the diffracted beams in certain directions that are permitted by the regular array of surface atoms are observed. Abbreviated LEPD.