NOVELTY - The pump (10) has a perforated element (14) intersecting a channel (22) formed on a surface of a channel unit (12). The channel guides gas molecules from an inlet (16) of the pump toward an outlet (18). The perforated element and the channel unit are moved relative to each other such that the gas molecules are urged along the channel toward the outlet for allowing the gas molecules to pass through the perforated element. The channel unit includes a slot (40) arranged to accommodate the perforated element at a point in which the perforated element intersects the channel.    USE - Multiple stage vacuum pump e.g. gas transfer pump such as kinetic pump e.g. molecular drag pump or turbo-molecular drag pump and oil vapor diffusion pump, and positive displacement pump, for providing vacuum used for industrial process e.g. manufacturing process of a semiconductor device e.g. integrated circuit, microprocessor, LED, flat panel display and solar panel, glass coating process, steel manufacture process, power generation process, vacuum distillation process and lithium ion battery production process, and scientific process i.e. manufacturing process of spectrometers or electron beam microscopes. Can also be used as an entrapment pump.    ADVANTAGE - The pump is provided with pumping mechanisms that can be driven by a single motor to improve pump system efficiency. The pump is provided with a vacuum pump mechanism with high pumping capacity and operating at lower consumption level with less space, so that gas throughput and cost of ownership or pump size can be enhanced.    DETAILED DESCRIPTION - The perforated clement and the channel unit are pump stators or pump rotors made of material selected from a group consisting of aluminum, aluminum alloy, steel and carbon fiber reinforced polymer or titanium. An INDEPENDENT CLAIM is also included for a vacuum pump mechanism.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a vacuum pump.    Vacuum pump (10)    Channel unit (12)    Perforated element (14)    Inlet (16)    Outlet (18)    Channel (22)    Slot (40)