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Energy

Free Positronium
 

Ps in 6.0 a.u. cavity

Ps in 5.0 a.u. cavity

Ps in 4.0 a.u. cavity

-0.25000 (theory)
-0.242 +- 0.004 (calculated)

-0.163 +- 0.008 (calculated)

-0.073 +- 0.011 (calculated)

ionized!

As the cavity sqeezes positronium, the energy rises.

At 4.0 a.u., the cavity is so small that the electron and positron can no longer behave as positronium ... they ionize, and the energy becomes positive.