Critical Potential Tube
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Critical Potential Tube

Filling:  
£671.25  exc. VAT    
(£805.50 Inc. VAT)

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Control Unit for Critical Potential TubesControl Unit for Critical Potential Tubes
  • Tube for Gustav-Hertz Experiment
  • Allows user to investigate inelastic collisions of electrons with inert gas atoms
  • Choice of helium or neon filling
  • Comes complete with shielding and battery unit
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Control Unit for Critical Potential Tubes

Control Unit for Critical Potential Tubes

£426.55
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  • Device to operate Critical Potential Tube
  • For use in Gustav Hertz Experiment
  • Output for saw tooth acceleration voltages
  • Plug-in power supply included

critical potential tube

The Franck-Hertz Experiment demonstrates the quantum nature of atoms: the Gustav Hertz Experiment is a development of this, in which atoms are excited by means of inelastic collisions with electrons.

These collisions need to take place inside a tube, like the Critical Potential Tube. This allows you to conduct the Gustav Hertz Experiment, and you may choose between a helium or neon filled tube depending on your requirements.

The Hertz electron tube is for quantitative investigations of inelastic collisions of electrons, with inert gas atoms. It can determine the ionisation energies of helium, or neon as well as resolution of the energy states of various primary and orbital angular-momentum quantum numbers.

The product comes complete with shielding and a battery unit for the collector voltage (battery not included).

Gustav Hertz experiment

Gustav Hertz' experiment is a development of the Franck-Hertz experiment. Atoms are excited or even ionised by means of inelastic collisions with electrons inside an evacuated Critical Potential Tube.

If the kinetic energy of the electrons exactly matches a critical potential or ionisation level, the electrons transfer all their energy to the atoms. They can then be drawn away to the collector ring inside the Critical Potential Tube, with the help of a small voltage. At this point, the collector voltage reaches a maximum. 

Critical potentials

Helium 

  • 2 3S: 19.8eV
  • 2 1S: 20.6eV
  • 2 3P: 21.0eV
  • 2 1P: 21.2eV
  • 3 3S: 22.7eV
  • 3 1S: 22.9eV
  • 3 3P: 23.0eV
  • 3 1P: 23.1eV
  • 4 3S: 23.6eV
  • 4 1S: 23.7eV
  • Ionisation: 24.6eV

Neon 

  • 2p53s1: 16.6eV
  • 2p53p1: 18.4eV
  • 2p54s1: 19.7eV
  • 2p54p1: 20.3eV
  • 2p54d1: 20.6eV
  • Ionisation: 21.6eV

Technical specification

  • Cathode filament voltage: UF ≤ 7V
  • Anode voltage: UA ≤ 60V
  • Anode current: IA ≤ 10mA
  • Collector voltage: Uc = 1.5V
  • Collector current: Ic ≤ 200pA

Helium tube

  • Dimensions: 35.1 x 28.2 x 22.1cm
  • Weight: 0.8kg

Neon tube

  • Dimensions: 35.6 x 27.9 x 22.9cm
  • Weight: 0.9kg

Do you have a question about this product or would like to purchase it? No problem at all. Simply call us on 020 7720 2266 between 09:00 and 17:00 Monday to Friday. 

You can also email us with your question by using the form below. A member of the Lab World Customer Care Team will respond to your enquiry personally as soon as they can.

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Related Products

Control Unit for Critical Potential Tubes

Control Unit for Critical Potential Tubes
£426.55
Add to Basket
 
  • Device to operate Critical Potential Tube
  • For use in Gustav Hertz Experiment
  • Output for saw tooth acceleration voltages
  • Plug-in power supply included
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