Alternatively, salt (sodium chloride) on a ceramic stick can be placed in the flame of Bunsen burner as the sodium vapor source. When the magnetic field is energized, the lamp image will be brighter. However, the magnetic field also affects the flame, making the observation depend upon more than just the Zeeman effect. These issues also plagued Zeeman's original work; he devoted considerable effort to ensure his observations were truly an effect of magnetism on light emission.
alternatively salt (sodium chloride) on a ceramic stick can be placed in the flame of bunsen burner as the sodium vapor source when the magnetic field is energized the lamp image will be brighter however the magnetic field also affects the flame making the observation depend upon more than just the zeeman effect these issues also plagued zeeman's original work; he devoted considerable effort to ensure his observations were truly an effect of magnetism on light emission