Correspondingly the molecules chiefly collide with the optically dense rotor blades, resulting in a highly efficient pumping action. at pressures below 10 -3 mbar (0.75 x 10 -3 Torr)) the mean free path of the gas molecules is larger then the spacing between the rotor and the stator blades (typically a few tenths of a millimetre). By means of a momentum transfer from the rotating rotor blades to the gas molecules their initially nondirectional thermal motion is changed in to a directional motion from the inlet flange of the pump in the axial direction towards the forevacuum flange. Located between the rotating rotor blades are stationary stator disks with blades arranged in the opposite direction. In principle, the turbomolecular pump is a turbine rapidly revolving in a housing where the rotor stages of the turbine Sectional drawing of a turbomolecular pump (TURBOVAC i) are equipped with a number of rotor blades.
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