We describe a fast electromagnetic valve for generation of a pulsed supersonic molecular beam. The valve produces 70 mgr;s pulses with typical intensities in the neighborhood of 1times;1022molecules srminus;1thinsp;sminus;1at frequencies to 35 Hz. It is triggered by a low voltagendash;low current pulsed power supply which activates externallyhyphen;mounted coils, minimizing problems of heat dissipation and electrical and magnetic interference. It also features a corrosion resistant gas reservoir isolated from the driving mechanism by a stainless steel bellows.
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