franck hertz experiment theory pdf

The original free-electron/mercury-atom collision experiment was first performed in 1914 by James Franck and Gustav Hertz who were later awarded the 1925 Nobel Prize for their work.

1 Abstract. In this experiment the rst excitation potential of gaseous mercury and neon atoms was investigated using the Franck-Hertz partial current method. The values of the potential found were 5:1 0:4eV and 19:2 0:5eV re-spectively. These agree with the accepted values of 4.9eV and 18.4-19.0eV respectively.

The original free-electron/mercury-atom collision experiment was first performed in 1914 by James Franck and Gustav Hertz who were later awarded the 1925 Nobel Prize for their work. Their simple, but elegant research represents one of the key experiments that helped to establish the “modern” atomic theory.

The Franck-Hertz experiment implements the energy exchange for state transitions through the collisions of atoms with electrons of certain energy, which is obtained by applying an accelerating electric field.

In the Franck-Hertz experiment, an electron beam is produced by thermionic emission from a filament. The electrons are accelerated, pass through the vapor, and are then retarded (deceler-ated) by a few volts before collection at the anode.

We conduct the classic Franck-Hertz experiment in which electrons are accelerated through a mercury vapor and inelastically collide. We nd the energy required to initiate inelastic collisions between electrons and mercury atoms to be 4:69 0:05 eV, in agreement with the lowest excited state of mercury (63P0).

This is a classic experiment which provided strong evidence against classical mechanics and in the favor of the Bohr model of quantized energy states. In 1914, James Franck and Gustav Hertz bom-barded mercury atoms with a beam of electrons and showed that the electrons lost discrete amounts of energy as they interacted by colliding with larger ...

The Franck-Hertz Experiment Objective: To measure the first excitation potential and the ionization potential of mercury atoms and to show that the energies of bound electrons are quantized.

Franck-Hertz Experiment in Mercury. The Franck-Hertz tube is an evacuated glass cylinder containing a drop of mercury. The tube contains three electrodes: indirectly-heated cathode, grid-form anode, and collector electrode. The electrodes are arranged in plane-parallel manner.

The Franck-Hertz experiment was conducted on a mercury tube and the data analysed using the theory of non equal spacing in the Franck-Hertz curve. The acquired data revealed an increase in distance to the successive maxima and minima.