Double focusing sector mass

Table 6.29 Main characteristics of double-focusing sector mass spectrometers...

Walder, A.J. and Ereedman, P.A. (1992) Isotopic ratio measurement using a double focusing sector mass analyzer with an inductively coupled plasma as an ion-source. J. Anal. At. Spectrom., 3, 571-575. 

When a double-focusing sector mass spectrometer is used for GC-HRMS of the ionic species in entire spectra, the mass spectrometer has to be scanned... 

Figure 3 Positive ion mode FAB mass spectrum using a double focusing sector mass analyser. The sample is dpC with piperidine in nitrobenzyl alcohol matrix. The parent ion mass, (M + H), is 307.3 Da.

With few exceptions, magnetic sector instruments are comparatively large devices capable of high resolution and accurate mass determination, and suited for a wide variety of ionization methods. Double-focusing sector instruments are the choice of MS laboratories with a large chemical diversity of samples. In recent years, there is a tendency to substitute these machines by TOE or by Fourier transform ion cyclotron resonance (FT-ICR) instruments. 

Combination of Magnetic and Electric Sector Fields - Double-focusing Sector Field Mass Spectrometer... 

Figure 3.5 Double-focusing sector field mass spectrometer with Nier-johnson geometry. (77. Kienitz (ed.), Massenspektrometrie (1968), Verlag Chemie, Weinheim. Reproduced by permission ofWiley-VCH)...

A special experimental arrangement of double-focusing sector field mass spectrometry - the... 

Figure 3.6 Schematicofa double-focusing sector field mass spectrograph with Mattauch-Herzog geometry with a linear imaging curve (double focusing for ions of all masses simultaneously) modified field combination with 70°. In the mass spectrograph, photographic ion detection or focal plane array detectors are used for quasi-simultaneous detection of separated ion beams. (H. Kienitz (ed.), Massen-spektrometrie (1968), Verlag Chemie, Weinheim. Reproduced by permission of Wiley-VCH)...

Figure 4.4 Schematic (a) and photograph of ion detector with extended dynamic range (b) in the double-focusing sector field mass spectrometer Element. (Reproduced by permission of Thermo Fisher Scientific, Bremen.)...

Double-focusing sector field mass spectrometer... 

An overview of commercial ICP mass spectrometers from different companies (quadrupole based ICP-MS with and without collision/reaction cell, double-focusing sector field instrumentation with single and multiple ion collectors, time-of-flight (ToF), ICP-ion trap-MS and non-commercial ICP-Fourier transform ion cyclotron resonance (FTICR) mass spectrometers is given in Figure 5.2. By using ion traps and FTICR mass spectrometers in ICP-MS isobaric interferences of atomic ions... 

As an alternative to commercial quadrupole based ICP-MS measurements at low mass resolution ( / 300), in 1996 Yiang and Douglas15 proposed a quadrupole ICP-MS system which allows a maximum mass resolution of 9000. At a mass resolution of 5000 the sensitivity was comparable to that of a commercial double-focusing sector field ICP-MS operated at the same mass resolution. Due to the very high continuum instrumental background of about lOOOcps no commercial high resolution quadrupole instrumentation with an inductively coupled plasma source exists and the development of high resolution quadrupole based ICP-MS has ceased. 

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