Principle
The "Zeeman effect" is the splitting up of the spectral lines of
atoms within a magnetic field. The simplest is the splitting up of
one spectral line into three components called the "normal Zeeman
effect". In this experiment the normal Zeeman effect as well as the
anomalous Zeeman effect are studied using a cadmium spectral lamp
as a specimen. The cadmium lamp is submitted to different magnetic
flux densities and the splitting up of the cadmium lines (normal
Zeeman effect 643.8 nm, red light; anomalous Zeeman effect 508,6nm,
green light) is investigated using a Fabry-Perot interferometer.
The evaluation of the results leads to a fairly precise value for
Bohr's magneton.
Tasks
- Using the Fabry-Perot interferometer and a selfmade telescope
the splitting up of the central line into different lines is
measured in wave numbers as a function of the magnetic flux
density.
- From the results of point 1. a value for Bohr's magneton is
evaluated.
- The light emitted within the direction of the magnetic field is
qualitatively investigated.
What you can learn about
- Bohr's atomic model
- Quantisation of energy levels
- Electron spin
- Bohr's magneton
- Interference of electromagnetic waves
- Fabry-Perot interferometer
Software included. Computer not provided.
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