P6.2.4.3 Franck-Hertz Experiment with Neon - Recording with the Oscilloscope

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P6.2.4.3 Franck-Hertz Experiment with Neon - Recording with the Oscilloscope

The Franck-Hertz experiment with neon is offered in two variations, experiments P6.2.4.3 and P6.2.4.4, which differ only in the means of recording and evaluating the measurement data. In both variations, the neon atoms are enclosed in a glass tube with four electrodes: the cathode K, the grid-type control electrode G1, the acceleration grid G2 and the target electrode A. Like the Franck-Hertz experiment with mercury, the acceleration voltage U is continuously increased and the current I of the electrons which are able to overcome the opposing voltage between G2 and A and reach the target is measured. The target current is always lowest when the kinetic energy directly in front of grid G2is just sufficient for collision excitation of the neon atoms, and increases again with the acceleration voltage. We can observe clearly separated luminous red layers between grids G1 and G2; their number increases with the voltage. These are zones of high excitation density, in which the excited atoms emit light in the visible spectrum.

Components of Experiment:

1 555 870 Ne Franck-Hertz tube
1 555 871 Holder with socket and screen
1 555 872 Connecting cable for Ne Franck-Hertz tube
1 555 880 Franck-Hertz supply unit
1 575 304 Digital storage oscilloscope 70 MHz two-channel
2 575 24 Screened cable, BNC/4 mm

Experiment Instructions Click Here