I have read that Lyman series of Hydrogen atom occur on the n = 2 level, and it is due to electron orbital coupling. Suppose I understand what is an electron-orbital coupling, and that one gets 3/2 and 1/2 total angular momentum for n = 2 level. But, from quantum mechanical derivation of the orbitals of Hydrogen atom, the energy level depends only on n quantum number, and that p orbitals caused by possible set of m numbers are degenerate. How total angular momentum causes energy splitting, if electron-orbital coupling is due to spin and angular momenta which are degenerate? Thank you.