Positronium Molecule Formation on Al (111)a

Abstract:

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A single crystal Al (111) sample cleaned by repeated cycles of ion bombardment and annealing was irradiated by a subnanosecond high density positron beam [1] and the resulting positronium lifetime spectra were measured using single shot positron annihilation lifetime spectroscopy (SSPALS) [2]. We observed the amount of positronium emitted dependence on the incident positron beam density, which indicates the formation of positronium molecules (Ps2) at the Al (111) surface [3]. The Ps2 formation probability appears to be extremely sensitive to surface contamination and further experiments under improved vacuum conditions are planned to clarify this effect.

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Periodical:

Edited by:

S. J. Wang, Z. Q. Chen, B. Wang and Y. C. Jean

Pages:

22-24

DOI:

10.4028/www.scientific.net/MSF.607.22

Citation:

S.H.M. Deng et al., "Positronium Molecule Formation on Al (111)a", Materials Science Forum, Vol. 607, pp. 22-24, 2009

Online since:

November 2008

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$35.00

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