Problem 4 – Fun with Vacuum Physics
To do surface physics, we need to put the entire experiment into
an ultra high vacuum so the air does not contaminate the surface.
To heat the metal sample, we use an electron gun. A 500 V power
supply has the positive lead connected to the metal sample, and the
negative connected to a filament that emits electrons. The
electrons boil off of the filament at 0 V, and are attracted to the...