Abstract
A simple system is described for the control of gas flow from a volatile liquid into an ion source. The system uses a Peltier cell to control the temperature of the liquid and hence its vapour pressure. The vapour is metered from above the liquid into the ion source through a long capillary tube. Since there are no moving parts in contact with the vapour, it is very well suited for use with corrosive substances. The system described is extremely stable, has a wide dynamic range and is suitable for many other applications such as gas chromatography and mass spectrometry.
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