Coaxial ion guide
First Claim
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1. A method of mass or ion mobility spectrometry comprising:
- trapping ions in an annular or co-axial ion trap to establish trapped ions, wherein the trapped ions are distributed around the entire circumference of the annular or co-axial ion trap; and
thenaxially ejecting at least some of said trapped ions, to establish ejected ions, from said annular or co-axial ion trap into an annular ion guide, wherein the ejected ions separate axially as the ejected ions travel along the ion guide, and wherein as the ejected ions travel along at least a portion of the length of the ion guide a motion of the ejected ions around the circumference of the annular ion guide is unrestricted; and
thenconverting the ejected ions from an ion beam having an annular shaped cross section to an ion beam having a non-annular shaped cross-section.
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Abstract
A method of mass and/or ion mobility spectrometry is disclosed comprising: trapping ions in an annular or co-axial ion trap; and then axially ejecting at least some of said ions from said annular or co-axial ion trap into an annular ion guide. Ions trapped in the ion trap are distributed around the entire circumference of the annular or co-axial ion trap. As the ions travel along at least a portion of the length of the ion guide their motion around the circumference of the annular ion guide is unrestricted and the ions separate axially as they travel along the ion guide.
27 Citations
20 Claims
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1. A method of mass or ion mobility spectrometry comprising:
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trapping ions in an annular or co-axial ion trap to establish trapped ions, wherein the trapped ions are distributed around the entire circumference of the annular or co-axial ion trap; and
thenaxially ejecting at least some of said trapped ions, to establish ejected ions, from said annular or co-axial ion trap into an annular ion guide, wherein the ejected ions separate axially as the ejected ions travel along the ion guide, and wherein as the ejected ions travel along at least a portion of the length of the ion guide a motion of the ejected ions around the circumference of the annular ion guide is unrestricted; and
thenconverting the ejected ions from an ion beam having an annular shaped cross section to an ion beam having a non-annular shaped cross-section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A mass or ion mobility spectrometer comprising:
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an annular or co-axial ion trap arranged and adapted to trap ions; an annular ion guide; and a control system arranged and adapted; (i) to trap ions in said annular or co-axial ion trap, wherein ions trapped in the ion trap are distributed around the entire circumference of the annular or co-axial ion trap; and (ii) to cause at least some ions within said annular or co-axial ion trap to be axially ejected from said annular or co-axial ion trap into said annular ion guide, to establish elected ions wherein as the ejected ions travel along at least a portion of the length of the ion guide the motion of the ejected ions around the circumference of the annular ion guide is unrestricted, and wherein the ejected ions separate axially as ejected travel along the ion guide; wherein an electrode configuration of the spectrometer is arranged and configured to convert the ejected ions from an ion beam having an annular shaped cross section to an ion beam having a non-annular shaped cross-section.
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20. A method of mass or ion mobility spectrometry comprising:
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trapping ions in an annular or co-axial ion trap; and
thenaxially ejecting at least some of said ions from said annular or co-axial ion trap into an annular ion guide.
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Specification