Detection
Noble gases analysis by static mass spectrometry Theory and instrumentation

Ion detection in gas source mass spectrometry is based on four inseparable components:

• the ionization yield of the species analyzed at the Nier source. This is low (a few percent) and depends on the setting of the source parameters seen previously (U₁, U₂, U_moy, U_R, I_trap, U_trap, etc.) and on the presence of other particles likely to compete with the analyzed element by capturing all or part of the electron flux emitted by the filament;

• the transmission efficiency of the ions produced in the source to the collector(s) via the flight tube. This is usually high, but depends on the vacuum level in the enclosure;

• the vacuum level, which must be in the ultra-high vacuum range