Method of operating quadrupoles with added multipole fields to provide mass analysis in islands of stability
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United States of America Patent
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May 4, 2010
Grant Date -
Dec 27, 2007
app pub date -
Feb 7, 2007
filing date -
Feb 7, 2006
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Abstract
radially confining ions having Mathieu parameters a and q within a stability region defined in terms of the Mathieu parameters a and q; c) adding an auxiliary excitation field to transform the stability region into a plurality of smaller stability islands defined in terms of the Mathieu parameters a and q; and, d) adjusting the two-dimensional substantially quadrupole field to place ions within a selected range of mass-to-charge ratios within a selected stability island in the plurality of stability islands.
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