Performance enhancement through use of higher stability...

Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means

Reexamination Certificate

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C250S3960ML

Reexamination Certificate

active

07935923

ABSTRACT:
A quadrupole mass filter (QMF) is provided. The QMF includes a plurality of rectangular shaped electrodes aligned in a symmetric manner to generate a quadrupole field. An aperture region is positioned in a center region parallel to and adjacent to each of the rectangular shaped electrodes. An incoming ion stream enters the aperture region so as to be controlled by the quadrupole field. A plurality of voltage sources provide a r.f. and d.c. signal to the electrodes for generating the quadrupole field. An auxiliary voltage source applies an auxiliary drive signal to the r.f. and d.c. signal to create new stability boundaries within the standard Mathieu stability regions with high-resolution around operating conditions where there are approximately no higher-order resonances.

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Konenkov et al., “Quadrupole mass filter operation with auxiliary quadrupolar excitation: theory and experiment” International Journal of Mass Spectrometry, 208 (2001), XP007908973, pp. 17-27.
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