Positronium
Positronium, usitate Ps imminutum, est systema quod in positrono consistit, electrono suaque antiparticula quae in atomo exotico, diserte onio, colligantur. Quod systema instabile est: duae particulae inter se exstinguuntur plerumque ad duos aut tris radios gamma efficiendos, secundum status versationis. Gradus energiae particularum graduum energiae atomi hydrogenii similes sunt, qui est status ligatus protonis et electronis; quia autem massa sic imminuitur, frequentiae linearum spectralium minus quam dimidium frequentiarum linearum hydrogeni congruentium sunt.

Stephanus Mohorovičić exsistentiam positronii in commentario in Astronomische Nachrichten anno 1934 edito praedixit, ubi positronium electrum nominavit.

Bibliographia
Adkins, G. S., R. N. Fell, et J. Sapirstein. 2000. "Order α2 Corrections to the Decay Rate of Orthopositronium." Physical Review Letters 84, no. 22 (29 Maii): 5086–89. . PMID 10990873. Arxiv hep-ph/0003028. Bibcode 2000PhRvL..84.5086A. S2cid=1165868.
Badertscher, A., P. Crivelli, W. Fetscher,  U. Gendotti, S. N. Gninenko, V. Postoev, A. Rubbia, V. Samoylenko, et D. Sillou. 2007. "An Improved Limit on Invisible Decays of Positronium." Physical Review D 75 (3): 032004. . Arxiv hep-ex/0609059. Bibcode 2007PhRvD..75c2004B. S2cid=9001914.
Cooke, D. A., P. Crivelli, J. Alnis, A. Antognini, B. Brown, S. Friedreich, A. Gabard, T. W. Haensch, K. Kirch, A. Rubbia, et B. Vrankovic. 2015. "Observation of positronium annihilation in the 2S state: towards a new measurement of the 1S-2S transition frequency." Hyperfine Interact 233 (1–3): 67–73. . Arxiv 1503.05755. Bibcode 2015HyInt.233...67C. S2cid=89605682.
Czarnecki, Andrzej, et Savely G. Karshenboim.l 2000. "Decays of Positronium." Proceedings of the International Workshop on High Energy Physics and Quantum Field Theory, ed. B. B. Levchenko et V. I. Savrin, 14: 538–44. Arxiv hep-ph/9911410. Bibcode 1999hep.ph...11410C.
Karshenboim, Savely G. 2003. "Precision Study of Positronium: Testing Bound State QED Theory." International Journal of Modern Physics A 19 (23): 3879–96. . Arxiv hep-ph/0310099. Bibcode 2004IJMPA..19.3879K. S2cid=14848837.
Mohorovičić, Stjepan. 1934. "Möglichkeit neuer Elemente und ihre Bedeutung für die Astrophysik." Astronomische Nachrichten 253 (4): 93–108.. Bibcode 1934AN....253...93M.

Electrodynamica quantica
Protonium

Notae

Nexus externi
"The Search for Positronium."
Laudatio Martini Deutsch, inventoris positronii.
De positroniis, positronio, et antihydrogeno. Positron Laboratory, Como Italiae.

Antimateria
Atomi exotici
Electrodynamica quantica
Onia
Particulae subatomicae
Physica molecularis