The measurement system detector

Once they have left the separation system the ions will meet the ion trap or detector which, in the simplest instance, will be in the form of a Faraday cage (Faraday cup). In any case the ions which impinge on the detector will be neutralized by electrons from the ion trap. Shown, after electrical amplification, as the measurement signal itself is the corresponding ion emission stream . To achieve greater sensitivity, a secondary electron multiplier pickup (SEMP) can be employed in place of the Faraday cup. 

V = High-frequency amplitude, rQ = Quadrupole inscribed radius f = High-frequency 

As a result of this linear dependency there results a mass spectrum with linear mass scale due to simultaneous, proportional modification of U and V. 

Range III M cannot pass, due to the blocking characteristics of the yz pair of rods. 

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