Durable emission of positronium negative ions from Na- and K-coated W(100) surfaces

Details Durable emission of positronium negative ions from Na- and K-coated W(100) surfaces Durable emission of positronium negative ions from Na- and K-coated W(100) surfaces

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012njph...14a5003t&link_type=abstract

New Journal of Physics, Volume 14, Issue 1, pp. 015003 (2012).

Physics

Scientific paper

The emission of positronium negative ions from Na- and K-coated W(100) surfaces has been studied. The emission efficiencies (the fractions of incident slow positrons yielding the ions) for both samples were found to be as high as 1.5%. Although the efficiencies decreased with time after coating, the effects were more durable than that for Cs coating. In particular, the efficiency after Na coating was still higher than 0.5% after three days. The successful development of a durable Ps- source opens the door to a new era of experimental investigations on the Ps- ion.

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