positronium velocity spectroscopy

positronium velocity spectroscopy

[‚päz·ə′trō·nē·əm və′läs·əd·ē spek′träs·kə·pē]
(spectroscopy)
A technique in which a solid surface is bombarded with a low-energy monoenergetic positron beam and the velocities of the emitted positronium atoms are measured to determine the energy and momentum spectrum of the density of electron states near the surface.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.