Mattauch-Herzog geometry instrument

Figure 3.5. Mattauch-Herzog geometry instrument. (Reproduced from C. Dass, in D. M. Desiderio, ed., Mass Spectrometry Clinical and Biomedical Applications, Vol. 2, by permission of Plenum Press, copyright 1994.)...

In 1967 Liebl reported the development of the first imaging SIMS instrument based on the principle of focused ion beam scanning [24]. This instrument, the ion microprobe mass analyzer, was produced by Applied Research Laboratories (Fig. 4.5). It used an improved hollow cathode duoplasmatron [25] ion source that eliminated filaments used in earlier sources and allowed stable operation with reactive gases. The primary ion beam was mass analyzed for beam purity and focused in a two-lens column to a spot as small as 2 pm. The secondary ions were accelerated from the sample surface into a double focusing mass spectrometer of Mattauch-Herzog geometry. Both positive and negative secondary ions were de-... 

Figure 9.23 (a) The Ion optic In the SPECTRO MS. Ions of a defined kinetic energy are introduced into the curved ESA (top). An Einzel lens focuses the ions (middle) into a quadrupole doublet (bottom), (b) The Mattauch-Herzog geometry of the SPECTRO MS. (Courtesy of SPECTRO Analytical Instruments, Inc., AMETEK Materials Analysis Division, www.spectro.com,www.ametek.com. Used with permission.)... 

Nowadays, forward geometry instruments are often constructed to be used in combination with an (optional) array detector, e.g., the JEOL HX-110 (EB), the Thermo Finnigan MAT 900 (EB) and the Micromass Autospec (EBE) instruments can be equipped in that way. The array detector is then located at the focus plane of the magnet, but different from the Mattauch-Herzog design it only covers a comparatively small m/z range simultaneously (Chap. 4.8). 

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