Efficient emission of positronium negative ions from Cs deposited W(100) surfaces

Details Efficient emission of positronium negative ions from Cs deposited W(100) surfaces Efficient emission of positronium negative ions from Cs deposited W(100) surfaces

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008njph...10l3029n&link_type=abstract

New Journal of Physics, Volume 10, Issue 12, pp. 123029 (2008).

Physics

14

Scientific paper

The emission of positronium negative ions from Cs deposited W(100) surfaces has been studied. A dramatic change in the emission efficiency was observed upon coating a W(100) surface with Cs. The conversion efficiency (the fraction of incident slow positrons yielding the ions) of the W(100) target with a 2.2×1014 atoms cm- 2 Cs coverage, measured over a time interval of 3×103 s immediately after deposition, was found to be 1.25%, which is two orders of magnitude higher than that obtained for the clean, uncoated W(100) surface and 45 times greater than the highest efficiency reported thus far.

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