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Mass spectrometer ion guide providing axial field, and method

  • US 7,868,289 B2
  • Filed: 04/30/2007
  • Issued: 01/11/2011
  • Est. Priority Date: 04/30/2007
  • Status: Active Grant
First Claim
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1. An ion guide comprising:

  • a plurality of parallel rods, arranged in multipole about an axis that extends lengthwise from a first end to a second end of said ion guide, to guide ions in a guide region along and about said axis;

    wherein each of said plurality of rods has a generally rectangular cross-section and is tapered along its length;

    a conductive cylindrical casing surrounding said plurality of rods;

    at least one voltage source, interconnected to said plurality of rods and to said casing to produce an axial electric field along said axis.

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