Multi-turn time-of-flight mass spectrometers with electrostatic sectors.
Multi-turn time-of-flight mass spectrometers with electrostatic sectors.
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具有静电扇区的多转飞行时间质谱仪。
DOI：
10.1002/jms.546
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
I. Katakuse
中科院分区：
文献类型：
--
作者：
M. Toyoda;Daisuke Okumura;M. Ishihara;I. Katakuse
飞行时间质谱仪的质量分辨率与其总飞行路径长度成正比。为了在合理的尺寸范围内获得足够长的战斗距离，多圈或多通道离子光学几何是必要的。我们研究了带静电扇区的多圈飞行时间质谱仪的离子光学性质。引入了“完美”聚焦条件的概念。在此基础上，研制了一种新型的多圈飞行时间质谱仪--穆尔图姆线性加速器。它由四个圆柱形电扇区和28个电四极透镜组成。它有一个60x70x20厘米大小的真空室。质量分辨率随着离子循环次数的增加而增加。经过501.5次循环后，质量分辨率达到35万(m/z=28，半高宽)。然而，穆尔图姆LINEAR PLUS分析仪并不简单；它使用了28个电动四极透镜。为了减少离子光学部件的数量，还研制了一种改进的多圈飞行时间质谱仪，即只由四个环状电扇区组成的穆尔图姆II。文中还讨论了利用多圈飞行时间质谱仪进行串联质谱分析的可能性。
The mass resolution of a time-of-flight (TOF) mass spectrometer is directly proportional to its total flight pathlength. Multi-turn or multi-passage ion optical geometries are necessary to obtain fight distances of sufficient length within reasonable size limitations. We have investigated ion optics for a multi-turn TOF mass spectrometer with electrostatic sectors. The concept of 'perfect' focusing conditions is introduced. Furthermore, a new type of multi-turn TOF mass spectrometer, the MULTUM Linear plus, was developed. It consists of four cylindrical electric sectors and 28 electric quadrupole lenses. It has a vacuum chamber 60 x 70 x 20 cm in size. Mass resolution is demonstrated to increase according to the number of ion cycles. A mass resolution of 350 000 (m/z = 28, FWHM) was achieved after 501.5 cycles. The MULTUM Linear plus analyzer is not simple, however; 28 electric quadrupole lenses are used. In order to reduce the number of ion optical parts, an improved multi-turn TOF mass spectrometer, the MULTUM II, consisting of only four toroidal electric sectors, was also developed. The possibility of tandem mass spectrometric applications using multi-turn TOF mass spectrometers is also discussed.