Radiant energy – Ionic separation or analysis – Methods
Reexamination Certificate
2007-02-20
2007-02-20
Wells, Nikita (Department: 2881)
Radiant energy
Ionic separation or analysis
Methods
C250S292000, C250S291000, C250S283000
Reexamination Certificate
active
11197083
ABSTRACT:
An aperture design for a linear ion trap is provided in which the aperture is optimized to minimize possible axial field inhomogeneities whilst preserving the structural integrity of the quadrupole rods. In general, the invention provides a linear ion trap for trapping and subsequently ejecting ions. The linear ion trap comprises a plurality of rods which define an interior trapping volume which has an axis extending longitudinally. One or more of the rods includes an aperture which extends both radially through the rod and longitudinally along the rod. The aperture being configured such that the ions can pass from the interior trapping volume through the aperture to a region outside the interior trapping volume. At least one recess is disposed adjacent the aperture, extending longitudinally along the rod and facing the interior trapping volume, the recess not extending radially through the rod.
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patent: 6797950 (2004-09-01), Schwartz et al.
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Schwartz Jae C.
Senko Michael W.
Thermo Finnigan LLC
Upham Sharon
Wells Nikita
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