Mass spectrometer ion guide providing axial field, and method
First Claim
Patent Images
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.
3 Assignments
0 Petitions
Accused Products
Abstract
An ion guide includes a plurality of rods, arranged about an axis that extends lengthwise from one end to the other of the guide. The rods guide ions in a guide region along and about the axis. A conductive casing surrounds the rods. The casing and the rods are geometrically arranged to produce an axial electric field along the axis. Specifically, the geometry is such that a first constant applied DC voltage (UDC), applied to the rods, and a second constant applied DC voltage (UCASE) applied to the casing, produce a voltage gradient between said casing and said axis that has a different magnitude at different positions along said axis.
-
Citations
25 Claims
-
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. - View Dependent Claims (2, 3, 4)
-
-
5. An ion guide comprising:
-
a plurality of parallel rods, arranged 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; a conductive cylindrical casing surrounding said plurality of rods; wherein each of said plurality of rods has a generally rectangular cross-section and is tapered along its length; wherein said casing and said plurality of rods are geometrically arranged so that a first constant applied DC voltage (UDC) applied to said rods, and a second constant applied DC voltage (UCASE) applied to said conductive casing, produce a voltage gradient between said casing and said axis that has a different magnitude at different positions along said axis, to produce an axial electric field along said axis. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 20, 21, 22)
-
-
15. A method comprising:
-
providing a plurality of parallel rods about an axis that extends lengthwise from a first end to a second end to guide ions in a guide region along and about said axis; providing a conductive cylindrical casing surrounding said plurality of rods; creating a multipolar electric field between said plurality of rods to contain ions in said guide region; applying a substantially DC voltage to said conductive casing and said rods, wherein each of said plurality of rods has a generally rectangular cross-section and is tapered along its length; wherein said casing and said plurality of rods are geometrically arranged so that said substantially DC voltage to said casing and said rods, produce a voltage gradient between said casing and said axis that has a different magnitude at different positions along said axis, to produce an axial electric field along said axis. - View Dependent Claims (16, 17, 18, 19)
-
-
23. 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 is oriented parallel to said axis, and has a slot extending along its length, and wherein the size of each slot varies along its lengthwise extent; 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. - View Dependent Claims (24, 25)
-
Specification