Method and apparatus for providing two-dimensional substantially quadrupole fields having selected hexapole components
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United States of America Patent
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Nov 28, 2006
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app pub date -
Sep 17, 2004
filing date -
Sep 25, 2003
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Abstract
A method and apparatus for manipulating ions using a two-dimensional substantially quadrupole field, and a method of manufacturing and operating an apparatus for manipulating ions using a two-dimensional substantially quadrupole field are described. The field has a quadrupole harmonic with amplitude A.sub.2 and a hexapole harmonic with amplitude A.sub.3. The amplitude A.sub.3 of the hexapole component of the field is selected to improve the performance of the field with respect to ion selection and ion fragmentation.
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