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

  • Wideband etalon allowing oberservation of Zeeman effects at multiple Hg wavelengths

  • Optional CCD camera with analysis software for Windows 10/11


Zeeman effect experiment is important 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. In addition, the wideband etalon allows the observation of Zeeman effect at other Mercury spectral lines of 577 nm, 436 nm and 404 nm with an optional set of filters.

The instruction manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.


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; transmittance: > 80%
Polarizer360º rotational
λ/4 Plateat 546 nm including mounting magnets
Eyepiece15 X; measuring range: 8 mm; resolution: 0.01 mm

Parts List

Pencil Mercury Lamp1
Condensing Lens1
F-P Etalon1
Interference Filter (546 nm)1
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 & software
1 set (option 1)
Interference filters with mount at 577 & 435 nm
1 set (option 2)

      Zeeman Effect Apparatus.png

Zeeman effect and intensity distribution of Mercury green line


No magnetic field applied (at 546 nm)


Magnetic field applied (transverse Zeeman at 546 nm)

LEAI-26-436-no.jpg LEAI-26-436.jpg

Before and after applying magnetic field at 436 nm

LEAI-26-577-no.jpg LEAI-26-577.jpg

Before and after applying magnetic field at 577 nm

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