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Analyte Ion Formation in PTR-MS

On its way from the Venturi-type inlet to the downstream end of the drift section, HsO ions undergo nonreactive and reactive collisions with any one of the conponents of air [51,52]. The water reagent gas PICI process causes the analyzed VOCs to be converted into [M+H] ions. [Pg.362]

The flow tube, which is about 20 cm long, acts as a reaction region that is maintained at about 1 mbar by action of a vacuum pump attached to its exit. These conditions afford thermalization and effective proton transfer as the hydronium ions drift along together with the VOC-loaded air. As PTR-MS does not necessitate an additional buffer gas, the analyte air is not diluted any further, a feature that contributes to the high sensitivity of the method. Furthermore, the original mole fraction of the analytes in the air is maintained. [Pg.362]

Ion Source Drift Tube Transfer Lens System TOF - MS 12 3 [Pg.363]


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