Physics Lab Equipment

LEAI-26 Zeeman Effect Apparatus with Electromagnet

LEAI-26 Zeeman Effect Apparatus with Electromagnet


  • Transverse and longitudinal Zeeman effects

  • Adjustable magnetic field intensity from electromagnet

  • Large magnet pole for uniform interference pattern

  • Optional CCD camera with analysis software


Zeeman effect experiment is an important experiment in modern physics to confirm the existence of atomic magnetic moment and spatial quantization. It can be used to determine atomic energy levels and g factor, and verify the theory of electron spin.


This LEAI-26 Zeeman effect experimental apparatus uses an electromagnet to split the spectral line of Mercury at 546.1 nm to generate π and σ lines. A direct reading microscope is used to measure the interference pattern from a F-P etalon. The axial hole on one magnet pole allows the Mercury light to propagate in the longitudinal direction, so both transverse and longitudinal Zeeman effects can be observed by using this apparatus. An optional CCD with analytical software can be used to acquire and analyze the interference pattern to calculate the Bohr magneton. As the magnet has a pair of large poles that creates a uniform magnetic field, clear and uniform interference rings are achieved.


Using this instrument, the following experiments can be conducted:


1. Observe transverse and longitudinal Zeeman effects of Mercury at 546.1 nm

2. Understand atomic magnetic moment and spatial quantization in atomic physics

3. Observe the splitting and the polarization of a Mercury spectral line at 546.1 nm

4. Determine the quantum number, the Bohr magneton, and Lande's factor

5. Learn how to use a Fabry-Perot etalon


Electromagnetmagnetic field strength: > 1.0 T
> 90º rotatory with an open hole in one pole (dia: 6 mm)
pole diameter: 25 mm
pole spacing: 10 mm


diameter: 40 mm
spacing: 2 mm (air)
finesse: ≥ 50
flatness:< λ/30
CWL: 589.3 nm
resolution (λ/dλ): > 2 x 105
reflectivity: > 90%
HR bandwidth: 100 nm
Pencil Hg lampemitter diameter: 6.5 mm; power: 3 W
Interference filterCWL: 546.1 nm; passband: < 10 nm; transmittance: > 80%
Polarizer360º rotational
λ/4 Plateincl mounting magnets
Eyepiece15 X; measuring range: 8 mm; resolution: 0.01 mm

Parts List

Pencil Mercury Lamp1
Condensing Lens1
F-P Etalon1
Interference Filter1
Reading Microscope1
Imaging Lens1
Power Supply Unit (Hg Lamp and Electromagnet)1
Optical Rail1
λ/4 Plate1
Tesla Meter with AC Adapter1
CCD, USB Interface & Software1 set (optional)

      Zeeman Effect Apparatus.png

Zeeman effect and intensity distribution of Mercury green line

(Click figure to enlarge)

 Zeeman Effect 1.jpg

No magnetic field applied

   Zeeman Effect 2.jpg

Magnetic field applied (transverse Zeeman π & σ components)

   Zeeman Effect 3.jpg

Zeeman π components

   Zeeman Effect 4.jpg

Zeeman σ components

(Click photos to enlarge)

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