Franck-Hertz experiment with neon - Recording and evaluation with CASSY

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 G₂ is 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.