Evidence for positronium molecule formation at a metal surface

D. B. Cassidy, S. H. M. Deng, and A. P. Mills, Jr.
Phys. Rev. A 76, 062511 – Published 26 December 2007

Abstract

We have observed a reduction in the amount of positronium emitted from an atomically clean Al(111) surface that depends on the incident positron beam density. We interpret this as evidence for the formation of molecular positronium, created following interactions between two pseudopositronium atoms trapped in a surface state. We find that this process is highly sensitive to the condition of the surface and is easily suppressed by changes thereupon. The implications of our data for planned spectroscopic studies of molecular positronium are discussed, as well as improvements to the experimental procedure that will allow more detailed measurements of the thermodynamics of the formation of this molecule from metal surfaces.

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  • Received 30 October 2007

DOI:https://doi.org/10.1103/PhysRevA.76.062511

©2007 American Physical Society

Authors & Affiliations

D. B. Cassidy, S. H. M. Deng, and A. P. Mills, Jr.

  • Department of Physics and Astronomy, University of California, Riverside, California 92521-0413, USA

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Issue

Vol. 76, Iss. 6 — December 2007

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