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Improved interfacing of a field ionization source with a quadrupole mass analyzer

1976; Elsevier BV; Volume: 22; Issue: 3-4 Linguagem: Inglês

10.1016/0020-7381(76)80090-3

1873-3034

M. Anbar, Eric Kempster,

Analytical Chemistry and Sensors

Significant improvement of interfacing field ionization (FI) sources with quadrupole mass analyzers (QMA) has been achieved by placing a ferrite insert at the detector end of the QMA and by installing a repeller electrode opposite the electron multiplier (EM). By installing a multipoint FI source ca. 1 cm from the entrance to a QMA, operated at a resolution of 250, a molar counting efficiency of ca. 3 × 1017 counts mol−1 has been achieved. This is comparable to that obtained with a sector magnet mass analyzer at the same resolution.