Positronium ·
e⁻ + e⁺
un
seel
.com · electron · positron · matter meets antimatter
Binding
6.80 eV
Lifetime
—
phase
—
Electron (e⁻, matter)
Positron (e⁺, antimatter)
511 keV γ photon
Center of mass
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.com · Positronium