Closed ion volume

The principle of Cl was first described by Munson and Field (Munson and Field, 1966). Cl has now developed into a widely used technique for structural determination and quantitation in GC-MS (Stan and Kellner, 1981). Instead of an open, easily evacuated ion source, a closed ion volume is necessary for carrying out Cl. In the high vacuum environment of the ion source, a reagent gas pressure of about... 

For Cl to be efficient, the reagent partial pressure in the source must be between 1 and 5 torr. With classic sources described earlier, it is necessary to replace the open ion volume used in El by a closed ion volume (see Figure 3.10). Indeed, an open ion volume does not allow attainment of the necessary partial pressure in the reagent because the gas is sucked in by the pumping system at the level of the source. The closed ion volume is not completely closed it is pierced with a hole to allow the... 

FIGURE 3.10 Open ion volume (left) for El and closed ion volume (right) for CL... 

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See also in sourсe #XX -- [ ]

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