Turbo Molecular Pump. Multiple stages of moving and fixed blades act to "swat" gas molecules towards the exhaust. Gases are then removed by a roughing pump. Cryo Pump. Pumping is achieved by "freezing" gas or vapor to very cold surfaces(Cryo-condensation). Light gases are also adsorbed by charcoal (Cryo-sorption). Pump requires periodic regeneration by warming the vanes.