Reststrahlen
/rɛstˈʃtrɑːlən/(also Restrahlen) Physics
noun
Electromagnetic radiation which is selectively reflected from the surface of a crystalline solid when the frequency of the incident radiation is approximately equal to the vibrational frequency of the ions constituting the solid.
Origin
Late 19th century; earliest use found in Nature: a weekly journal of science. From German Reststrahlen residual rays from Rest remainder + Strahlen, plural of Strahl ray.
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