Opinions on Positronium

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Positronium (Ps) is a system consisting of an electron and its anti-particle, a positron, bound together into an exotic atom, specifically an onium. The system is unstable: the two particles annihilate each other to produce two or three gamma-rays, depending on the relative spin states. The orbit and energy levels of the two particles are similar to that of the hydrogen atom (electron and proton). However, because of the reduced mass, the frequencies of the spectral lines are less than half of the corresponding hydrogen lines.

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Thanks to this graph, we can see the interest Positronium has and the evolution of its popularity.

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