Mattauch

Mattauch-Herzog geometry. An arrangement for a double-focusing mass spectrometer in which a deflection of n/A radians in a radial electrostatic field is followed by a magnetic deflection of nil radians. 

Figure 1 Schematic diagram of a Mattauch-Herzog geometry spark source mass spectrometer using an ion-sensitive plate detector.

Mattauch-Herzog geometry, which simultaneously focuses all resolved masses onto one plane, allowing the integrating properties of an ion-sensitive emulsion to be used as the detector. Although electrical detection with an electron multiplier can be applied, the ion-sensitive emulsion-coated glass photographic plate is the most common method of detection and will be described in this article. 

J. Mattauch and R. F. K. Herzog. Z. Physik. 89,786, 1934. This is the original paper showing the double-focusing geometry necessary to focus onto a plane rather than at a single point. 

E. Everling, L. A. Koenig, J. H. E. Mattauch, and A. H. Wapstra. I960 Nuclear Data Tables. National Academy of Sciences, Washington, 1961, Part I. Comprehensive listing of Qvalues for reactions involving atoms with A < 66. 

Fig. 3.20. Schematic d rawi ng of a Mattauch-Herzog magnetic-sector instrument with simultaneous mass detection.

The Mattauch-Herzoggeometry (Fig. 3.20) enables detection of several masses simultaneously and is, therefore, ideal for scanning instruments [3.49]. Up to five detectors are adjusted mechanically to locations in the detection plane, and thus to masses of interest. Because of this it is possible to detect, e. g., all isotopes of one element simultaneously in a certain mass range. Also fast, sensitive, and precise measurements of the distributions of different isotopes are feasible. This enables calculation of isotope ratios of small particles visible in the image. The only commercial instrument of this type (Cameca Nanosims 50) uses an ion gun of coaxial optical design, and secondary ion extraction the lateral resolution is 50 nm. 

Reduction of the measurement time for element distributions is possible by simultaneous detection of several masses. This can be achieved only by use of a magnetic sector field spectrometer with Mattauch-Herzog geometry [3.49] (Fig. 3.20) and parallel detection of up to five masses by mechanically adjusted electron multipliers. 

Das Promethium konnte als ungeradzahliges Element stabile Isotope mit der Masse 145 und 147 besitzen, die jedoch auf Grund der Mattauch-schen Isobarenregel auBer Frage stehen, so daB alle Promethium-Isotope instabil sind. Es besteht jedoch die Moglichkeit, daB noch unent-deckte Promethium-Isotope existieren, die eine langere Halbwertszeit als Pm 147 aufweisen. Hierfiir kommen hauptsachlich das Pm 145 und... 

Mattauch, J. Die Uranspaltprodukte nach einem amerikanischen Bericht. 

Fig. 4.22. Mattauch-Herzog double-focusing mass spectrograph providing direction and momentum focusing of ions on a plane. [73] Reprinted from Ref. [1] with permission. American Association for the Advancement of Science, 1979.

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). 

Christi, M., B. Mattauch, H. Irngartinger, and A. Goldmann. 1986. Additionen von Benzvalene und Nitriloxide. Eine Synthese fur Benzvalen-3-Carbonitril. Chemische Berichte 119 950. 

According to the well-founded rules of Josef Mattauch, no stable isotopes of element 43 are to be expected. This may explain why it has never been prepared and concentrated from natural products (46). 

Hahn, O., Strassman, F., Mattauch, J. and Ewald, H. (1943) Geologische Altersbestimmungen mit der Strontiummethode. Chemische Zeitung, 67, 55-56. 

Mattauch, J. (1937) Das Paar Rb87-Sr87 and die Isobarenregel. Naturwissenschaften, 25, 189-191. 

A high vacuum laser ion source is combined with a dynamic (ToF-MS) or static mass spectrometer (Mattauch-Herzog instrument) for the separation of the ion beams formed and used in LIMS for multi-element major, minor and trace analysis of compact solid samples (bulk analysis).74... 

Spark ion source in spark plasma by e impact plasma 50 000 ne 1 018-1019 crrr3 M+ high < 1( 4 Pa double-focusing SFMS (Mattauch-Herzog) traces, high-purity materials, geology... 

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