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 Bohrs magneton.
Tasks
1.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.
2.From the results of point 1. a value for Bohrs magneton is evaluated.
3.The light emitted within the direction of the magnetic field is qualitatively investigated.
What you can learn about
Bohrs atomic model
Quantisation of energy levels
Electron spin
Bohrs magneton
Interference of electromagnetic waves
Fabry-Perot interferometer
Materiallist Product Amount
CCD camera Moticam 352 for PC, 0.3 megapixels 88037-01 1
Connecting cord, 32 A, 1000 mm, blue 07363-04 1
Connecting cord, 32 A, 1000 mm, red 07363-01 1
Connecting cord, 32 A, 750 mm, red 07362-01 1
Connecting cord, 32 A, 500 mm, blue 07361-04 1
Connecting cord, 32 A, 250 mm, blue 07360-04 1
Connecting cord, 32 A, 500 mm, red 07361-01 1
Polarising filter,on stem 08610-00 1
Polarization specimen, mica 08664-00 1
Connecting cord, 32 A, 250 mm, red 07360-01 1
Iris diaphragm 08045-00 1
Lens, mounted, f +300 mm 08023-01 1
Lens holder 08012-00 4
Lens, mounted, f +50 mm 08020-01 2
Slide mount for optical bench, h = 80 mm 08286-02 2
Slide mount for optical bench, h = 30 mm 08286-01 5
Base for optical bench, adjustable 08284-00 2
Optical profile-bench, l 1000mm 08282-00 1
Digital multimeter 2010 07128-00 1
Capacitor,electrolyt.,22000 mic-F 06211-00 1
Variable transformer, 25 VAC/ 20 VDC, 12 A 13531-93 1
Power supply for spectral lamps 13662-97 1
Rot.table for heavy loads 02077-00 1
Pole pieces, drilled, conical 06480-03 1
Electromagnet w/o pole shoes 06480-01 1
Cadmium lamp for Zeeman effect 09050-20 1
Fabry-Perot interferometer 09050-02 1
