How to Determinate Optimized Parameters of Franck-Hertz Experiment

In this paper,the effects of the cathode voltage VF,the first grid-voltage VGl,and the repulsion voltage VG 2Aetc. on the IA-VG2 Kcurves of the Ar-filled Franck-Hertz tube are discussed,there-by determine the optimized parameters of the Franck-Hertz experiment.