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Negatively charged particle with spin 1/2. A component of mundane terrestrial matter, and part of all neutral atoms and molecules. It has a mass about 1/1800 that of a proton. Its antiparticle is the positron.

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Dipole moment operator for many a electrons wave function

From textbooks (such as Optical Spectroscopy of Inorganic, Henderson, 2006) I know that the electric dipole moment operator is defined for one electron as: $$ \hat{\mu} = e \hat{r} $$ But then suppose …
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