Chromatography / GC/MS-TOF

GC/MS-TOF Description

The most commonly used mass spectrometers in gas chromatography are systems based on quadrupole analyzers. Other analyzers used in GC/MS are ion traps. Both analyzers used the same principle. Four poles are connected into the electrical circuit that generates radiofrequency field. Change of this electrical field enables to generate scanning in time. Fragments comming from ion source through ion optics enters the analyzer. The ions separation is accomplished by applying alternating RF frequency and DC voltage to diagonally opposite ends of the quadrupole, which in turn allows aspecific mass fragment to pass through the quadrupole filter.

Quadrupole analyzer

Picture 1: Scheme of quadrupole analyzer

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