Glancing-angle scattering and neutralization of a positron beam at metal surfaces

An energetic (10-100 eV) beam of Ps was formed by scattering a well-collimated, small-diameter beam of 30-400-eV positrons off surfaces of Al(110) and clean and oxygen-coated Cu(100) at glancing angles of 6-42 deg with respect to the surface. The angular distribution (FWHM approx = 20 deg ) of the P...

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Veröffentlicht in:	Phys. Rev. Lett.; (United States) 1987-02, Vol.58 (6), p.595-598
Hauptverfasser:	GIDLEY, D. W, MAYER, R, FRIEZE, W. E, LYNN, K. G
Format:	Artikel
Sprache:	eng
Schlagworte:	640303 > Atomic, Molecular & Chemical Physics-- Positronium, Muonium, & Muonic & Mesic Atoms & Molecules ANTILEPTONS ANTIMATTER ANTIPARTICLES ATOMIC AND MOLECULAR PHYSICS BEAM NEUTRALIZATION BEAMS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COATINGS COLLISIONS Condensed matter: electronic structure, electrical, magnetic, and optical properties COPPER Cross-disciplinary physics: materials science rheology EFFICIENCY Electron and ion emission by liquids and solids impact phenomena ELEMENTARY PARTICLES ELEMENTS ENERGY RANGE EV RANGE EV RANGE 10-100 EV RANGE 100-1000 Exact sciences and technology FERMIONS Impact phenomena (including electron spectra and sputtering) INCIDENCE ANGLE LEPTON BEAMS LEPTONS Materials science METALS Metals, semimetals and alloys NONMETALS Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Other electron-impact emission phenomena Other interactions of matter with particles and radiation OXYGEN PARTICLE BEAMS Physics POSITRON BEAMS POSITRON COLLISIONS POSITRONIUM POSITRONS SCATTERING Specific materials TRANSITION ELEMENTS 640301 > Atomic, Molecular & Chemical Physics-- Beams & their Reactions
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Beschreibung
Zusammenfassung:	An energetic (10-100 eV) beam of Ps was formed by scattering a well-collimated, small-diameter beam of 30-400-eV positrons off surfaces of Al(110) and clean and oxygen-coated Cu(100) at glancing angles of 6-42 deg with respect to the surface. The angular distribution (FWHM approx = 20 deg ) of the Ps beam was determined and the relative Ps formation efficiency (3-5%) was measured as a function of incident positron beam energy and angle. Future uses of the Ps beam in atomic and surface physics is discussed. 15 ref.--AA(US).
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.58.595