Positron Reemission from Thin W(100) Foil in 10-6 Torr Pressure
- 1 October 1994
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 33 (10B) , L1493
- https://doi.org/10.1143/jjap.33.l1493
Abstract
The production of low-energy positron beams for positron-gas scattering experiments has been tested using thin W(100) foils in high-vacuum pressure ( 10-6 Torr). The W foil was baked for cleaning and used as a positron moderator in situ. The efficiency of positrons reemitted from the thin foil was 14±2% for a 1000-Å-thick foil and 10±2% for a 2000-Å-thick one. The positron work function of the W(100) surface in 10-6 Torr was -1.9±0.3 eV. The energy width in situ was 1.5±0.2 eV, narrower than that exposed to air. The feasibility of the brightness-enhancement method in 10-6 Torr for positron-gas scattering experiments was discussed.Keywords
This publication has 6 references indexed in Scilit:
- Experimentation with thin single crystal W foils as slow positron transmission mode moderatorsApplied Physics A, 1988
- Positron-beam-brightness enhancement: Low-energy positron diffraction and other applicationsPhysical Review B, 1985
- Measurement of positron reemission from thin single-crystal W(100) filmsPhysical Review B, 1985
- Observation of defects associated with the Cu/W(110) interface as studied with variable-energy positronsPhysical Review B, 1983
- Positron and positronium emission from tungsten (111)Physical Review B, 1983
- Positron work functions in transition metalsSolid State Communications, 1976