When electrons collide with positrons, their antimatter counterparts, unstable pairs can form in which both types of particle orbit around each other. Named ‘positronium,’ physicists have now produced this intriguing structure using a diverse range of positron targets—from atomic gases to metal films. However, they have yet to achieve the same result from vapours of nanoparticles, whose unique properties are influenced by the ‘gases’ of free electrons they contain in well-defined, nanoscopic regions.
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Source: Phys.org