[oil] diffusion pump, DP

The (oil) diffusion pump heats the oil to a high temperature. The oil vapor is sprayed out at a high speed from the nozzle. The residual gas molecules are carried with the aid of the jet flow of the vapor. The back side of the pump is evacuated with a rotary pump. The pump mechanism is simple and its price is low. Since the diffusion pump operates from 10^-1 Pa and its evacuation speed is high, the pump is used for evacuation of the TEM camera chamber with a large evacuation volume and large gas emission. The working pressure is from 10^-1 to 10^-8 Pa. When oil-free, high vacuum is required, the pump cannot be used. The pump is not suitable for pumping H₂O.