Positronium | Wikipedia audio article
Channel: wikipedia tts
Date: 25/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Positronium


00:00:35 1 States
00:01:07 1.1 Measurements
00:02:39 2 Energy levels
00:04:33 3 History
00:05:33 4 Exotic compounds
00:09:12 5 Natural occurrence
00:10:25 6 See also
00:11:37 7 References
00:12:14 8 External links
00:12:34 See also



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SUMMARY
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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 predominantly 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 (which is a bound state of a proton and an electron). However, because of the reduced mass, the frequencies of the spectral lines are less than half of the corresponding hydrogen lines.