For ten points, what effect describes the splitting of spectral lines under the influence of a magnetic field.
Similar to the Stark effect, calculations in the weak-field limit yield Lande's formula for the energy shift.  The strong field, or Paschen-Back limit, gives an energy shift proportional to the Bohr magneton and the spin quantum numbers.  For ten points, what effect describes the splitting of spectral lines under the influence of a magnetic field.
Similar to the Stark effect, calculations in the weak-field limit yield Lande's formula for the energy shift.  
Zeeman effect