单词 | overcritical binding |
释义 | overcritical binding [`ō·vǝr´krid·ǝ·kǝl `bīnd·iŋ] ATOMIC PHYSICS A binding energy for electrons in atoms which is so large that a vacancy in the bound state results in the spontaneous formation of an electron-positron pair; predicted to occur when the atomic number exceeds 173. |
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