According to thorough researches among documents, instruments and experiments the trace the story of the collaboration between a great theoretical physicist, Hendrik Anton Lorentz, and a master in experimentation physicist, Pieter Zeeman, that lead the discovery the spectral lines splitting due to the interaction between magnetism and light, then called “Zeeman effect”.
In 1902, exactly a century ago, Zeeman and his colleague Lorentz won the Nobel Prize in Physics for this discovery.