Experiment to Demonstrate Normal Zeeman Effect
This experiment involves observing the splitting of the red cadmium line perpendicular in transverse configuration or parallel in longitudinal configuration to an external magnetic field. The observation in longitudinal configuration is made possible by a stepped hole on the pole piece of the electromagnet. The light from the cadmium lamp passing through the FabryPérot etalon causes interference rings to arise, which like the spectral lines themselves are split into doublets or triplets depending on the direction of the external magnetic field. The splitting of the interference rings is recorded with the help of a Moticam 1 digital camera. A red filter on the focussing lens of the Moticam selects the light of the red cadmium line, while an aperture optimises the depth of field. The accompanying software allows for qualitative observation of the live image as well as quantitative assessment with the help of photographs of the screen. The occurrence of linear or circular polarisation is analysed with the help of the polarising filter or the four-wavelength base plate with a polarising attachment. The whole experiment is set up on a stable precision optical bench system.