<P> with g the electron - spin g - factor (about 2), resulting in a total magnetic moment, μ, </P> <Dl> <Dd> μ = μ L + μ S (\ displaystyle (\ boldsymbol (\ mu)) = (\ boldsymbol (\ mu)) _ (L) + (\ boldsymbol (\ mu)) _ (S)). </Dd> </Dl> <Dd> μ = μ L + μ S (\ displaystyle (\ boldsymbol (\ mu)) = (\ boldsymbol (\ mu)) _ (L) + (\ boldsymbol (\ mu)) _ (S)). </Dd> <P> The interaction energy therefore becomes </P>

Who used quanta to explain emission and absorption