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A mechanical beam chopper with small dimensions is presented. The shape of the generated neutral beam pulses is calculated and experimental results are discussed. The microchopper is based on the operation principle of neutron choppers. It is operated in vacuum and generates molecular beam pulses at a repetition rate of 10 kHz with pulse lengths easily adjustable between 5 and ≪1 μs. The chopper can be used for time‐of‐flight applications and inherently acts as a high velocity pass filter.