Sommerfeld introduced the fine structure constant.
The potential energy associated with the Zeeman effect is proportional to the Lande g-factor, one component of momentum, and a quantity name for this man. That quantity named for this man is equal to the magnetic dipole moment of an orbiting electron in the ground state. He is the namesake of a constant equal to the most probable distance between the proton and electron in a certain system, his namesake radius. While studying predictions of a model named for this man, (*) Sommerfeld introduced the fine structure constant. This man developed a model which he used to derive the Rydberg formula for the spectral lines of hydrogen. For 10 points, name this Danish physicist whose namesake model of the hydrogen atom only allowed electrons to orbit at a discrete set of distances from the nucleus.
The potential energy associated with the Zeeman effect is proportional to the Lande g-factor, one component of momentum, and a quantity name for this man.
Niels Bohr