Berlin 2014 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 23: Low Temperature Plasmas II

P 23.1: Hauptvortrag

Donnerstag, 20. März 2014, 14:00–14:30, SPA HS201

The Franck-Hertz experiment: 100 years ago and now — •Zoltan Donko¹, Peter Magyar^1,2, and Ihor Korolov¹ — ¹Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Budapest, Hungary — ²Roland Eotvos University, Budapest, Hungary

James Franck and Gustav Ludwig Hertz have published 100 years ago the findings of their famous experiment [1] that has demonstrated the quantized nature of atomic energy levels. Since that time this experiment has attracted the attention of generations. In our studies we have developed an experimental Franck-Hertz cell, which operates on the basis of photoemission. The electrical characteristics of this cell have been measured in argon gas over a wide range of pressure. An exact description of the motion of the electrons in the experiment requires a treatment at the level of the kinetic theory [2] due to the appearance of non-equilibrium effects in the electron transport. Therefore we applied Monte Carlo simulation to trace electrons. The computations provided the electrical characteristics of the cell, the energy and velocity distribution functions, and the transport parameters of the electrons, as well as the rate coefficients of different elementary processes.

[1] J. Franck and G. Hertz: Verh. Deut. Phys. Ges. 16, 457 (1914). [2] F. Sigeneger, R. Winkler, and R. E. Robson, Contrib. Plasma Phys. 43, 178 (2003). [3] P. Magyar, I. Korolov and Z. Donko: Phys. Rev. E 85, 056409 (2012).