F-H measurement by Alisha and Ning: final draft


The quantization of energy states of neon and argon are measured and analyzed in the Franck-Hertz experiment. The main idea of the Franck Hertz experiment is to demonstrate that energy levels are quantized and discrete within atoms by obtaining Franck Hertz curves. Franck-Hertz curves are linearly increasing curves but their minimas are not equally spaced due to the transfer of energy during collisions. And this idea that an atom occupies one of the atom’s ”quantum energy levels” is consistent with Niel Bohr’s model. Our experiment precisely illustrates the key concept of the Franck-Hertz Experiment. We found the discrete energy levels of neon to occur at \(16.66\pm 0.51\) eV, which is consistent with the value recorded on NIST (\(16.62eV\)) within uncertainty. Whereas, for argon it occurs at \(10.80\pm 0.02\) eV, which is slightly smaller than the value recorded on NIST website (\(11.55eV\)).


The goal of the Franck-Hertz experiment is to demonstrate that electrons occupy only discrete, quantized energy states for neon and argon atoms.


Bohr’s theory is one of the early models in quantum mechanics, and it was first confirmed experimentally by James Franck and Gustav Hertz in 1914. Bohr model suggests that electrons only occupy discrete energy levels, which is a significant modification of classical physics. The purpose of this lab is to reproduce the Franck Hertz experiment with argon and neon atoms, and to see whether the lab results are consistent with the theoretical values.