# US 2018/0025896 A1 · Ion guide and mass spectrometer using same

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- Number: US 2018/0025896 A1
- Document ID: US20180025896A1
- Status: Published application
- Kind: A1
- Application number: 15/549,228
- Filed: 2015-02-23
- Published: 2018-01-25
- Earliest claimed: 2015-02-23
- Assignees: Hitachi High-Technologies Corporation
- Applicants: Hitachi High-Technologies Corporation
- Inventors: Masuyuki SUGIYAMA; Hideki HASEGAWA; Masao SUGA; Hiroyuki SATAKE; Yuichiro HASHIMOTO
- Web page: https://patentgrep.com/patent/US20180025896A1

## CPC

- H01J 49/063: {Multipole ion guides, e.g. quadrupoles, hexapoles}
- H01J 49/42: Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

A first rod electrode set has a first center axis, into which ions and air current are introduced. A second rod electrode set has a second center axis at a distance from the first center axis, from which the ions are discharged. A power supply applies voltages to the first rod electrode set and the second rod electrode set. The first rod electrode set and the second rod electrode set have a region where the sets overlap each other in the longitudinal direction, and form a single multipole ion guide by being combined to each other in the region. Different offset DC voltages are applied to the first rod electrode set and the second rod electrode set, respectively, and a DC potential for moving the ions to the second rod electrode set in the region is formed, the ions having been guided by the first rod electrode set.

## Claims

### Claim 1

An ion guide comprising:
a first rod electrode set which has a first center axis, and into which ions and air current are introduced;
a second rod electrode set which has a second center axis at a distance from the first center axis, and from which the ions are discharged; and
a power supply that applies voltages to the first rod electrode set and the second rod electrode set.,
wherein the first rod electrode set and the second rod electrode set have a region where the sets overlap each other in the longitudinal direction, and form a single multipole ion guide by being combined to each other in the region where the sets overlap each other,
wherein different offset DC voltages are applied to the first rod electrode set and the second rod electrode set, respectively, from the power supply, and
wherein the offset DC voltage forms a DC potential for moving the ions to the second rod electrode set in the region where the sets overlap each other, the ions having been guided by the first rod electrode set.

### Claim 2 (depends on 1)

The ion guide according to claim 1,
wherein, in the single multipole ion guide, an interval between rod electrodes of a part of the first rod electrode set becomes wider than the side into which the ions and the air current are introduced, and an interval between rod electrodes of a part of the second rod electrode set becomes wider than the side from which the ions are discharged.

### Claim 3 (depends on 1)

The ion guide according to claim 1,
wherein the first rod electrode set and the second rod electrode set are quadrupoles, and the single multipole ion guide is a hexapole.

### Claim 4 (depends on 1)

The ion guide according to claim 1,
wherein the first rod electrode set and the second rod electrode set are quadrupoles, and the single multipole ion guide is an octupole.

### Claim 5 (depends on 1)

The ion guide according to claim 1,
wherein the center of distribution of neutral particles included in the air current and the center of distribution of ions are different at an outlet of the ion guide.

### Claim 6 (depends on 1)

The ion guide according to claim 1,
wherein a difference in offset DC voltage of the first rod electrode set and the second rod electrode set is 0.1 V to 100 V.

### Claim 7 (depends on 1)

The ion guide according to claim 1,
wherein the first rod electrode set and the second rod electrode set are divided into a plurality of segments considering the same position in the longitudinal direction as a division point, and in each of the segments, a segment DC voltage which generates an electric field in which the ions are accelerated in an outlet direction is applied from the power supply.

### Claim 8 (depends on 1)

A mass spectrometer comprising:
an ion source which generates ions;
a mass spectrometry portion which performs mass spectrometry with respect to the ions;
an ion guide which transports the ions generated by the ion source to the mass spectrometry portion; and
the ion guide according to claim 1 as the ion guide.