Sample introduction batch inlet

Batch inlet. This classical method of sample introduction is still a very useful and necessary inlet for both liquids and gases giving a steady sample flow rate. However it requires fairly large samples of materials which are thermally stable and of adequate vapour pressure. Mixed spectra result from multicomponent samples. 

The purpose of the inlet system is to permit introduction of a representative sample into the ion soutca with minimal loss of vacuum. Most modern mass spectrom-ciers are equipped with several types of inlets to accommodate various kinds of samples these include batch inlets, direct probe inlets, chromatographic inlets, and capillary electrophoretic inlets. 

Batch inlets should enable a constant and reliable flow rate of the sample during the analysis, and be inert to the analytes. Gases and volatile liquids are introduced into El or Cl sources from a glass or metal reservoir of known volume (that can be heated to 350°C) by way of a gold or steel foil that has one (or several) pinhole(s) (0.005 to 0.02 mm diameter). The introduction of liquids can be controlled by placing the... 

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