This Austrian Article points out that Positronium Anions Ps-e- exist.
http://positron.mpi-stuttgart.mpg.de/messungen/chemie_e.html
"The antiparallel orientation of positron spin and electron spin is called para-positronium, the parallel orientation ortho-positronium."
Para-Positronim should form the (electron-positron-electron) particle, Electronium
which may still be undetected .
Frederick
