Consider the normal Zeeman effect applied to the 3d to 2p transition.
(a) Sketch an energy-level diagram that shows the splitting of the 3d and 2p levels in an external magnetic field. Indicate all possible transitions from each m_i state of the 3d level to each m_i state of the 2p level.
(b) Which transitions satisfy the m_i=0, l selection rule?
(c) Show that there are only 3 different transition energies.
