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An instrument is introduced that combines a scanning tunneling microscope ͑STM͒ and a small volume ͑300 l͒ flow reactor, for the in situ study of catalytic surfaces at semi-industrial conditions. The tip is led through a gold membrane separating the reactor from the rest of the STM. We show ͑1͒ that the scanning through the membrane is possible with no noticeable effect of the membrane; ͑2͒ that it is possible to image surfaces in a gas flow of 10 ml/min, and that the imaging is unaffected bydoi:10.1063/1.1149193 fatcat:76spsn7ytrawdfb3mhpyl7b2oi