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Homework Help: Franck hertz Experiment-Ionization vs Excitation

  1. May 22, 2012 #1
    Franck hertz Experiment--Ionization vs Excitation

    1. The problem statement, all variables and given/known data
    We performed the Franck-Hertz experiment with neon gas. As we raised the accelerating voltage, the electrons gained enough energy to raise the energy of the neon through inelastic collisions. Those electrons lose some energy and and can't reach the cathode due to the retarding voltage which in turn causing the voltage to drop. When the gas returns to a lower state, the collisions with the electrons are again elastic and the electrons reach the cathode, restoring the higher current. I understand that process, however, I have an analysis question that ask "Why doesn't the gas ionize when the accelerating voltage is raised beyond the ionizing potential of neon.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
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