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A new calculation of the electron's self-energy improves determination of fundamental constants
It came when the one electron of the hydrogen atom transitioned from the 2P 1/2 energy level to the 2S 1/2 level. (The leftmost number is the principal quantum number, much like the discrete but ...
Nature18d
The ‘quantum’ principle that says why atoms are as they are
The basic hydrogen atom is the simplest of all atoms ... which Bohr characterized with different values of a first, ‘principal’ quantum number 2. This bold hypothesis could explain some ...