Franck-Hertz Apparatus II – Quantum Energy State Demonstrator with Digital Readouts

The Franck-Hertz Apparatus II is a modernized version of the classic Franck-Hertz Experiment setup, designed to demonstrate fundamental quantum phenomena. Featuring updated electronics, improved voltage stabilization, and digital readouts for both voltage and current, this advanced model makes it easier than ever to explore the existence of discrete quantum states.

At the heart of the apparatus is an argon-filled Franck-Hertz tube, capable of achieving 5–7 clear current maxima. A stabilized filament, grid, and anode voltage system allow precise control, while fully shielded coax cables reduce electrical noise for clean, accurate data.

By accelerating electrons toward a counterelectrode, students and researchers can directly observe how electrons transfer quantized energy during collisions with argon atoms. These interactions produce the characteristic valleys in the current-voltage curve, serving as direct evidence of quantum energy levels.

This apparatus is ideal for university physics labs, advanced teaching, and research, offering both manual and automatic scanning modes with output to an oscilloscope or chart recorder.

Anode Current Range: 0.1 nA – 1 μA

Digital Readouts: 3-1/2 digit display for voltage and current

Scanning Modes: Automatic or manual scan

Power Requirement: Dual-channel oscilloscope required (not included)