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Multi-turn time-of-flight mass spectrometers with electrostatic sectors

✍ Scribed by Michisato Toyoda; Daisuke Okumura; Morio Ishihara; Itsuo Katakuse

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
978 KB
Volume
38
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

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 × 70 × 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. Copyright © 2003 John Wiley & Sons, Ltd.

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