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Evidence for positronium molecule formation at a metal surface
Physical Review A. Atomic, Molecular, and Optical Physics
We have observed a reduction in the amount of positronium emitted from an atomically clean Al͑111͒ 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 planneddoi:10.1103/physreva.76.062511 fatcat:m6zmj3mtmvalvdsevfq5z2vr6y