Positronium Molecule Formation on Al (111)a |
| Journal |
Materials Science Forum (Volume 607) |
| Volume |
Positron and Positronium Chemistry |
| 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 |
| Online since |
November, 2008 |
| Authors |
S.H.M. Deng,
D.B. Cassidy,
A.P. Mills
|
| Keywords |
Aluminum, Positron, Positronium, Positronium Molecule |
| Abstract |
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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