Arrangement Mattauch-Herzog

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. 

A special experimental arrangement of double-focusing sector field mass spectrometry - the Mattauch-Herzog type mass spectrometer has double-focusing properties for ions of all masses... 

Figure 16.5 Mass spectrometer with magnetic analyser, (a) Nier-Johnson assembly (b) View of the directional focusing by the magnetic sector (the entrance and exit planes are oblique with respect to the angle of incidence of the beam, ensuring focusing) (c) Mattauch-Herzog assembly (d) Arrangement of a double focusing spectrometer (e.g. R = 40 cm and R = 60 cm).

In a particular arrangement of the magnetic and electric sectors (Mattauch-Herzog geometry) simultaneous double focusing for all masses can be achieved in the same plane >, permitting the use of a photographic plate (Fig. 3). 

MicroChannel plates are based on the same principle as the channeltron (Fig. 26 C) and can be regarded as an array of small channeltrons of rather short length (a few mm instead of cm) arranged side by side in one plate similar to the photoplates of Mattauch - Herzog instruments. They are used in TOF instruments and for the simultaneous detection of ions in sector field mass spectrometers. The major problem to be solved in the latter case was the fast readout of the signals, and various techniques have been developed for this purpose. A first, very elaborate version of such a device was described as early as 1974 [159] more modem ones suitable for tandem mass... 

---