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Home / Physics / Modern Physics / Quantum Physics / Stern-Gerlach apparatus
Nobel Prize in Physics, 1943 · Otto Stern

Show that angular momentum is quantized.

One atomic beam, two spots: direct evidence of quantized angular momentum, on a benchtop.

Stern-Gerlach apparatus
Stern-Gerlach apparatus · available in the U.S. only through American Scientific
Exclusive U.S. distributorAmerican Scientific, LLC
PHYWE, since 1913Göttingen, Germany
Built for U.S. labs110V/60Hz, U.S. warranty and parts
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Stern-Gerlach apparatus
✓ Available in the U.S. 110V/60Hz Adapted U.S. Exclusive
Modern Physics / Quantum Physics

Stern-Gerlach apparatus

Article No. 09054-88

The Stern-Gerlach experiment demonstrates that the spatial orientation of angular momentum is quantized. More than 100 years have passed since the experiment was first carried out by Stern and Gerlach. Today’s technical possibilities make it possible to perform this experiment using an apparatus that is both compact and easy to operate.

Dimensions of the apparatus, height × width × depth (mm)150 × 870 × 165
Weight5200 g
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Available in the United States, 110V/60Hz adapted for direct use in U.S. labs
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Available through American Scientific

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Try it yourself

Switch on the magnet

Turn up the inhomogeneous magnetic field and scan the detector. The single atomic beam splits cleanly into two.

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What your students will do
1

Form the atomic beam

A beam of atoms travels through the apparatus toward the detector.

2

Apply the magnetic field

An inhomogeneous field deflects atoms according to the orientation of their magnetic moment.

3

Scan the detector

Moving the detector across the beam shows one peak with the field off and two separate peaks with it on.

A great fit for
Quantum MechanicsAtomic PhysicsModern PhysicsAdvanced Undergraduate Lab
Two beamsDirect evidence of spin quantization
Compact870 mm long, benchtop sized
Classic resultThe 1922 experiment, in your lab
Detector position (mm)Beam intensityfield offfield on-3-2-10123

Typical result: a single beam profile splits into two peaks when the field is applied (illustrative).

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Common questions
Does it work on U.S. power?

Yes. Units supplied through American Scientific are adapted for 110V/60Hz and supported in the U.S., including warranty and replacement parts.

What else do I need to run the experiment?

Tell us about your lab in the form above and we'll put together a complete, ready-to-teach configuration, so nothing is missing on day one.

Can grant funding cover this?

Often, yes. Many institutions fund PHYWE equipment through NSF, Title IV and CTE programs, and our team can help you find and apply for the right opportunity.

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