Elementary Particle Physics pp 160-170 | Cite as

# Positronium

Chapter

## Abstract

An electron and a positron can form bound states in just the same way as an electron and a proton. The bound states of e^{−} and e^{+} are known as *positronium* states. The spectrum of positronium states is similar to that of hydrogen since the Coulomb force is the same in both cases. The proton in hydrogen can, to a good approximation, be taken to be a fixed center around which the electron orbits. In positronium, however, both partners have the same mass. As always, this two-body problem corresponds mathematically to the motion of a single particle with the reduced mass about a fixed center.

## Keywords

Angular Momentum Orbital Angular Momentum Coulomb Force Feynman Rule Principal Quantum Number
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## Copyright information

© Springer-Verlag Berlin Heidelberg 1990