Quadrupole Mass Spectrometry


The feature that makes the MicroPole System unique is the MicroPole Analyzer (MPA), a grouping of nine quadropoles that takes full advantage of ultraprecision optical etching processing technology and glass/metal joint technology. The development of the MPA has enabled the creation of the world's smallest residual gas analyzer, while offering the same or better sensitivity as conventional, larger mass spectrometers. The analyzer is a plug-in unit. It features a sensor unit that has already been calibrated for partial pressures, and offers absolute total and partial pressure measurement.

■Measurement principle

The Residual Gas Analyzer consists of an ion source, a mass spectrometer, and a measurement section. The residual gas is ionized when it collides with the thermoelectrons discharged from the high-temperature filament, and the ions that are thereby created accelerate and converge onto the mass spectrometer. At the mass spectrometer, direct and alternating current voltages are applied to the four cylindrical electrodes (quadropoles), which allows the ions to be separated by mass. The separated ions are detected as electric current by the Faraday cup. The ion current is proportional to the mass (partial pressure) of the residual gas.

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Micropole System QL Series
Micropole System QL Series

Quadrupole Mass Analyzer