The 4p state in potassium is split by its spin-orbit, Ask an Expert

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The 4P state in potassium is split by its spin-orbit interaction into the 4P(3/2) (lamda = 766.41 nm) and 4P(1/2) (lamda = 769.90 nm) states. (The wavelengths are for the transitions to the ground state.) Calculate the spin-orbit energy splitting and the internal magnetic field causing the splitting.

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