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 enables oberserving Zeeman effects at other Hg spectral lines

  • 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. In addition, thanks to a wideband etalon equipped, it enables observing Zeeman effect at other Mercury spectral lines (e.g. 577 nm, 436 nm & 404 nm) with optional filters. 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 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 Filter1
Reading Microscope1
Imaging Lens1
Power Supply Unit (Hg Lamp and Electromagnet)1
Optical Rail1
λ/4 Plate1
Tesla Meter with AC Adapter1
Interference filters with mount at 577, 435 & 404 nm; CCD, USB interface & software1 set (optional)

      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 filed at 436 nm

LEAI-26-577-no.jpg LEAI-26-577.jpg

Before and after applying magnetic filed at 577 nm

Copyright © Lambda Scientific Systems, Inc. 2010-2019. All rights reserved.