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{The The  Franck-Hertz experiment is essential to the modern understanding of the nature of atoms. Particularly, the experiment is important to the understanding of atomic structure, and serves as evidence that energy levels of atoms are discrete. In this version of the experiment, Argon, Neon and Mercury were chosen because of their monatomic nature. A standard Franck-Hertz experimental set-up was modified so that it might be possible to resolve fine structure present in the observed signal. The observed signal was then analyzed. Minima and maxima of the signal were plotted in order to extract the lowest excitation energy for each element. Data was then compared to predetermined values in order to verify the authenticity of the experiment.} experiment.