Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Reexamination Certificate
2011-05-03
2011-05-03
Nguyen, Kiet T (Department: 2881)
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
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.
REFERENCES:
patent: 6075244 (2000-06-01), Baba et al.
patent: 6403955 (2002-06-01), Senko
patent: 6441370 (2002-08-01), Khosla et al.
patent: 6465792 (2002-10-01), Baptist
patent: 6784424 (2004-08-01), Willoughby et al.
patent: 6797950 (2004-09-01), Schwartz et al.
patent: 6844547 (2005-01-01), Syka
patent: 6870158 (2005-03-01), Blain
patent: 6891157 (2005-05-01), Bateman et al.
patent: 7045797 (2006-05-01), Sudakov et al.
patent: 7208729 (2007-04-01), Syms
patent: 1396174 (1988-05-01), None
patent: 1758706 (1992-08-01), None
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.
Konenkov et al., “Upper Stability Island of the Quadrupole Mass Filter with Amplitude Modulation of the Applied Voltages” 2005 American Society for Mass Spectrometry, pp. 379-387.
Akinwande Akintunde I.
Cheung Kerry
Velásquez-García Luis F.
Gauthier & Connors LLP
Massachusetts Institute of Technology
Nguyen Kiet T
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