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Di-positronium, or dipositronium, is a molecule consisting of two atoms of positronium. It was predicted to exist in 1946 by John Archibald Wheeler,[1] and subsequently studied theoretically, but was not observed until 2007 in an experiment done by David Cassidy and Allen Mills at the University of California, Riverside. The researchers made the positronium molecules by firing intense bursts of positrons into a thin film of porous silica, which is the chemical name for the mineral quartz. Upon slowing down in silica, the positrons were captured by ordinary electrons to form positronium atoms.[2]


  1. ^ J. A. Wheeler, Polyelectrons, Annals of the New York Academy of Sciences 48, #3 (1946), pp. 219–238.
  2. ^ Cassidy, D. B. & Mills, Jr., A. P. (2007-09-13), " ", Nature 449: 195–197, DOI 10.1038/nature06094
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Di-positronium". A list of authors is available in Wikipedia.
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