Ionisation Potential Setup

We are offering Ionisation Potential Setup useful in Physics and Material Science Lab. The ionisation potential i.e. The energy required to remove an electron completely from the atom.

The experiment is consists of the following:

• Argon filled tetrode
• Filament Power Supply
• Power Supply for VG1K
• Power Supply for VKA
• Power Supply for VG2K
• Saw tooth waveform for CRO display
• Multirange Voltmeter
• Multirange Ammeter

All this is housed in a cabinet with meters and adjustment knobs on the front panel. The set-up can also directly display the anode current variation with VG2K on the oscilloscope screen. It can thus be used as a laboratory experiment as well as for demonstration to a group of students.

Analysis of the Data

Point by point data for the anode current with VG2K changing in steps of 1V at VG1K equal to 1.5V and VKA equal to 3.0V can be verified experimentally by drawing a graph. The on-set of the anode current and the point where the slope of the current changes can be determined by locating the points of intersection of the lines. These points are at 16V and 31V respectively. The former corresponds to the ionization potential and the latter for the ionization again. The average value of the ionization potential thus found is 15.5 eV compared with the accepted value of 15.6eV.