Converging multipole ion guide for ion beam shaping
AssigneeAgilent Technologies, Inc.
InventorsJAMES L. BERTSCH, Michael Ugarov
Life of this patent
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Abstract
A multipole ion guide comprises rods disposed about an axis, each of the rods having a first end and a second end remote from the first end. Each of the rods is disposed at a respective greater distance from the axis at the first end than at the second end. The multipole ion guide comprises means for applying a radio frequency (RF) voltage between adjacent pairs of rods, wherein the RF voltage creates a multipole field in a region between the rods; and means for applying a direct current (DC) voltage drop along a length of each of the rods. A mass spectroscopy system is also disclosed.
Claims19
A multipole ion guide, comprising:
- rods disposed about an axis, each of the rods having a first end and a second end remote from the first end, wherein each of the rods is disposed at a respective greater distance from the axis at the first end than at the second end;
- means for applying a radio frequency (RF) voltage between adjacent pairs of rods, wherein the RF voltage creates a multipole field in a region between the rods;
- and
- means for applying a direct current (DC) voltage drop along a length of each of the rods.
A mass spectroscopy system comprising a multipole ion guide, the multipole ion guide comprising:
- rods disposed about an axis, each of the rods having a first end and a second end remote from the first end, wherein each of the rods is disposed at a respective greater distance from the axis at the first end than at the second end;
- means for applying a radio frequency (RF) voltage between adjacent pairs of rods, wherein the RF voltage creates a multipole field in a region between the rods;
- and
- means for applying a direct current (DC) voltage drop along a length of each of the rods.
A multipole ion guide, comprising:
- an input and an output comprising a geometry configured to create radio frequency (RF) multipolar field of order hexapolar or greater;
- an output comprising a geometry configured to create a two or more substantially quadrupolar RF field regions;
- and
- a transition region between the input and the output where the rf multipolar field of order hexapolar or greater transitions to the substantially quadrupolar RF fields.
A multipolar ion guide as claimed in claim 20, wherein the order of the multipolar RF field is n and a number of distinct substantially quadrupolar RF field regions created at the output is m, and wherein n=2m+2.
Dependencies are inferred from the claim text.