JP5667569B2 - 4極質量フィルタとして動作可能な二次元半径方向放出イオントラップ - Google Patents
4極質量フィルタとして動作可能な二次元半径方向放出イオントラップ Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
- H01J49/34—Dynamic spectrometers
- H01J49/42—Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
- H01J49/4205—Device types
- H01J49/422—Two-dimensional RF ion traps
- H01J49/423—Two-dimensional RF ion traps with radial ejection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
- H01J49/34—Dynamic spectrometers
- H01J49/42—Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
- H01J49/4205—Device types
- H01J49/421—Mass filters, i.e. deviating unwanted ions without trapping
- H01J49/4215—Quadrupole mass filters
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- Electron Tubes For Measurement (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Description
x2-y2=r0 2
Y‐電極320については次の通りである。
x2-y2=-r0 2
X‐電極対310及びY‐電極320を等量だけ引き伸ばすことにより、X‐Y(即ち、四つ折り回転)対称性を備えると共に中心線305のところにゼロRF電位を有するRFフィールド(RF電圧の印加時)が生じる。中心線RF電位をなくすと、イオン注入プロセスのm/z依存性が実質的に減少すると共に同一のRFトラッピング電圧振幅では広い範囲のm/zを有するイオン注入が可能である。加うるに、平衡RFフィールドにより、イオン注入を比較的高いトラッピングRF電圧振幅(及びそれに応じてマチウパラメータqの高い値)で行うことができ、これは、空間電荷キャパシティに関する利点、望ましくない低いm/zイオンがなくなるという利点及び高いイオン周波数分散という利点(イオン注入中におけるイオンの高分解能隔離又は放出を容易にする)を備えている。代表的な構成例では、各電極205a,b,c,dは、少なくとも1.01・r0に等しく、好ましくは、1.07・r0〜1.2・r0の距離rだけ中心線から間隔を置いて設けられる。
Claims (11)
- 二次元イオントラップ型質量分析計であって、
4本の細長いロッド状電極を有し、各電極は、中心線に向いた双曲半径r0の双曲面及び前記電極の厚さを貫通して延びる孔を備え、
前記4本のロッド状電極は、前記中心線から距離rだけ等間隔を置いて位置され、rは前記双曲半径r0よりも大きく、
イオンをイオントラップの内部に半径方向に封じ込めるRFトラッピングフィールドを発生させるようRFトラッピング電圧を前記ロッド状電極に印加するRF電圧源を有し、
イオンを前記イオントラップの内部に軸方向に封じ込めるポテンシャル井戸を生成するようDCオフセットを前記ロッド状電極又は前記ロッド状電極の外方に位置決めされた1組の軸方向トラッピング電極に印加するDC電圧源を有する、イオントラップ型質量分析計。 - rのr0に対する比は、少なくとも1.01である、請求項1記載のイオントラップ型質量分析計。
- rのr0に対する比は、1.07と1.20の間である、請求項1記載のイオントラップ型質量分析計。
- 前記RFトラッピングフィールドは、前記RFトラッピングフィールドの4極成分の振幅の少なくとも0.2パーセントの振幅をもつ12極成分を有する、請求項1、2又は3記載のイオントラップ型質量分析計。
- 前記RF電圧源は、フィルタリングDC成分を前記ロッド状電極に印加するよう選択的に動作可能であり、
前記DC電圧源は、DCオフセットを前記ロッド状電極又は前記軸方向トラッピング電極のうちの少なくとも何本かに印加し又はこれらから除去して選択されたイオンが前記イオントラップ型質量分析計を長手方向に横切ることができるようにするよう選択的に動作可能であり、
前記イオントラップ型質量分析計は、質量フィルタとして選択的に動作可能である、請求項1〜4のうちいずれか1項に記載のイオントラップ型質量分析計。 - 各々が対応の孔に近接して位置決めされた1組の検出器を更に有する、請求項1記載のイオントラップ型質量分析計。
- 前記ロッド状電極は、入口端部と出口端部との間に延び、前記イオントラップ型質量分析計は、前記出口端部に近接して位置決めされた検出器を更に有する、請求項5記載のイオントラップ型質量分析計。
- 第1の励起電圧を第1の対向した対をなすロッド状電極間に印加する振動励起電圧源を更に有する、請求項1〜7のうちいずれか1項に記載のイオントラップ型質量分析計。
- 前記振動励起電圧源は、第2の励起電圧を第2の対向した対をなすロッド状電極間に印加するよう構成されており、前記第1の励起電圧は、周波数及び位相のうちの少なくとも一方に関して前記第2の励起電圧とは異なっている、請求項8記載のイオントラップ型質量分析計。
- 前記第1の励起電圧は、前記RFトラッピング電圧の周波数の1/3に等しい周波数を有する、請求項8記載のイオントラップ型質量分析計。
- 請求項1乃至10のいずれか1項に記載のイオントラップ型質量分析計を備えた質量分析装置。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US12/205,750 | 2008-09-05 | ||
US12/205,750 US7947948B2 (en) | 2008-09-05 | 2008-09-05 | Two-dimensional radial-ejection ion trap operable as a quadrupole mass filter |
PCT/US2009/055777 WO2010028081A2 (en) | 2008-09-05 | 2009-09-02 | Two-dimensonal radial-ejection trap operable as a quadrupole mass filter |
Publications (3)
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JP2012502433A JP2012502433A (ja) | 2012-01-26 |
JP2012502433A5 JP2012502433A5 (ja) | 2012-10-18 |
JP5667569B2 true JP5667569B2 (ja) | 2015-02-12 |
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JP2011526174A Active JP5667569B2 (ja) | 2008-09-05 | 2009-09-02 | 4極質量フィルタとして動作可能な二次元半径方向放出イオントラップ |
Country Status (6)
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US (2) | US7947948B2 (ja) |
EP (1) | EP2356669A2 (ja) |
JP (1) | JP5667569B2 (ja) |
CN (1) | CN102138196B (ja) |
CA (1) | CA2736120C (ja) |
WO (1) | WO2010028081A2 (ja) |
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US8415617B2 (en) | 2013-04-09 |
JP2012502433A (ja) | 2012-01-26 |
EP2356669A2 (en) | 2011-08-17 |
CN102138196A (zh) | 2011-07-27 |
CN102138196B (zh) | 2014-07-02 |
US20110186733A1 (en) | 2011-08-04 |
US7947948B2 (en) | 2011-05-24 |
WO2010028081A2 (en) | 2010-03-11 |
CA2736120A1 (en) | 2010-03-11 |
US20100059670A1 (en) | 2010-03-11 |
WO2010028081A3 (en) | 2010-04-22 |
CA2736120C (en) | 2014-06-03 |
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