According to Dirac, the ^ 2S--and ^ 2P--orbital should have same energies, but the interaction between the electron and the vacuum makes some energy shift on ^ 2S --.
The ^ 2S--and ^ 2P--orbital should have same energies --. This is according to Dirac. The interaction between the electron and the vacuum makes some energy shift on ^ 2S --. This is according to Dirac.