FIELD ASYMMETRIC ION MOBILITY SPECTROMETER

To provide a practical plane FAIMS device having variable convergent power, improved transmissivity and improved resolution.SOLUTION: First and second divided plane electrodes each composed of three or more segments extending in parallel to the analysis axis of the device are arranged with an analys...

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Bibliographic Details
Main Authors ROCH ANDRZEJEWSKI, ROGER GILES
Format Patent
LanguageEnglish
Japanese
Published 11.03.2021
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Summary:To provide a practical plane FAIMS device having variable convergent power, improved transmissivity and improved resolution.SOLUTION: First and second divided plane electrodes each composed of three or more segments extending in parallel to the analysis axis of the device are arranged with an analysis clearance therebetween, and ions are pushed to move in parallel to the analysis axis inside of this clearance. In a FAIMS mode, a voltage waveform group so as to form an asymmetrical time-dependent electric field for ion mobility spectrometry in the analysis clearance is applied to the segments of the two divided plane electrodes. This voltage waveform group is composed so that the equi-field strength line of the electric field is curved within a plane perpendicular to the analysis axis, which causes ions differing in mobility to be converged toward a space area. Each space area extends along a curved equi-field strength line within the plane. A convergence control unit is provided that allows a user to change the curvature of the equi-field strength line.SELECTED DRAWING: Figure 2 【課題】可変な収束力、改善された透過率及び改善された分解能を有する実用的な平面FAIMS装置を提供する【解決手段】装置の分析軸に平行に延在する3以上のセグメントからそれぞれ成る第1及び第2の分割平面電極が間に分析間隙を挟んで配置され、この間隙内でイオンが分析軸に平行に押し動かされる。FAIMSモードでは分析間隙内にイオン移動度分光分析用の非対称な時間依存性電場を形成するような電圧波形群が前記2つの分割平面電極のセグメントに印加される。この電圧波形群は前記電場の等電場強度線が分析軸に垂直な面内で曲がった線になるように構成されており、これが移動度の異なるイオンを異なる空間領域へ向けて収束させる。各空間領域は前記面内でそれぞれ曲がった等電場強度線に沿って延在している。等電場強度線の曲率を変えることをユーザに許可する収束制御部が設けられる。【選択図】 図2
Bibliography:Application Number: JP20200133337