I want to design Franck and Hertz Experimental set up by myself. I want to use flat filament, cathode, grids and anode.

I request all to give me suggestions about the materials to be used for filament, grid, cathode and anode.

The lowest pressure that I can achieve is 0.001 milli bar.

ANOTHER PROBLEM THAT I AM WORRIED ABOUT IS HOW CAN I INSERT FROM ATMOSPHERE INTO THE GLASS CHAMBER, PREVENTING OXIDISATION.

SUGGESTIONS ARE REQUESTED.

THANKS IN ADVANCE

N Das