Radiant energy – Ionic separation or analysis – With sample supply means
Reexamination Certificate
2005-05-24
2005-05-24
Lee, John R. (Department: 2881)
Radiant energy
Ionic separation or analysis
With sample supply means
C250S282000, C250S292000, C250S288000
Reexamination Certificate
active
06897438
ABSTRACT:
A method and apparatus for manipulating ions using a two-dimensional substantially quadrupole field, and a method of manufacturing an apparatus for manipulating ions using a two-dimensional substantially quadrupole field are described. The field has a quadrupole harmonic with amplitude A2, an octopole harmonic with amplitude A4, and higher order harmonics with amplitudes A6and A8. The amplitude A8is less than A4. The A4component of the field is selected to improve the performance of the field with respect to ion selection and ion fragmentation. The selected A4component can be added by selecting a degree of asymmetry under a 90° rotation about a central axis of the quadrupole. The degree of asymmetry is selected to be sufficient to provide the selected A4component.
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Ding Chuan-Fan
Douglas Donald J.
Soudakov Mikhail
Abeles Daniel C.
Eckert Seamans Cherin & Mellott , LLC
Lee John R.
Smith, II Johnie L
University of British Columbia
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