Quantum Physics III Chapter 2: Hydrogen Fine Structure
This states that the energy scale of hydrogen bound states is a factor of α2 smaller than the rest energy of the electron, that is, about 19000 times smaller. We can thus rewrite the possible energies as: En = −1 2α 2 mc2 1 n. (2.1.6) The typical momentum in the hydrogen atom is p≃ ~ a 0 = me2 ~ = e2 ~c mc → p≃ α(mc), (2.1.7)
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