Study of solids by use of nonthermalized positrons

We have measured the energy distribution of positrons reemitted from the surfaces of solids after being implanted at low energy. It is shown that this provides a unique possibility to study energy losses of a charged particle down to near-thermal energy. Such measurements are used to estimate the po...

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Veröffentlicht in:	Phys. Rev. Lett.; (United States) 1986-10, Vol.57 (14), p.1789-1792
Hauptverfasser:	NIELSEN, B, LYNN, K. G, CHEN, Y.-C
Format:	Artikel
Sprache:	eng
Schlagworte:	360104 - Metals & Alloys- Physical Properties ALUMINIUM ANTILEPTONS ANTIMATTER ANTIPARTICLES CHALCOGENIDES Condensed matter: electronic structure, electrical, magnetic, and optical properties COPPER CROSS SECTIONS Cross-disciplinary physics: materials science rheology DATA ELEMENTARY PARTICLES ELEMENTS ENERGY GAP ENERGY LOSSES ENERGY SPECTRA Exact sciences and technology EXPERIMENTAL DATA FERMIONS INFORMATION LEPTONS LOSSES MATERIALS SCIENCE METALS Metals, semimetals and alloys NUMERICAL DATA Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Other interactions of matter with particles and radiation OXIDES OXYGEN COMPOUNDS Physics Positron annihilation POSITRONS SLOWING-DOWN Specific materials SPECTRA SURFACE PROPERTIES THERMALIZATION TIME MEASUREMENT TRANSITION ELEMENTS TRAPPING
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Zusammenfassung:	We have measured the energy distribution of positrons reemitted from the surfaces of solids after being implanted at low energy. It is shown that this provides a unique possibility to study energy losses of a charged particle down to near-thermal energy. Such measurements are used to estimate the positron thermalization time in Al. A dramatic change in this energy distribution was observed after oxidation of the Al surface. We attribute this to the band gap of the oxide. Trapping of epithermal positrons with a remarkably high cross section was observed for both Al and Cu.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.57.1789