Double mass spectrometer system

Vance and Bailey [94] also carried out measurements of velocity distributions of product ions using a double mass-spectrometer system similar to the one used by Giese and Maier [95] combined with the retardation product-ion analysis by Menendez et al. [96]. They studied the charge transfer and dissociative charge transfer reactions of Hj and N2 with H2, as well as the reaction + H2 H3 + H, and the results yielded considerable new information on the reaction mechanism. 

Double mass spectrometer systems were developed in order to give mass-analyzed beams of reactant ions having narrow energy distributions and widely variable kinetic energy, while retaining the obvious advantage of mass spectrometric analysis of the product ions. Several variations on this basic technique have been developed and are described in Chapters 10-12. An example is shown in Fig. 1 and described below. 

The experimental results reported in this paper were obtained using a longitudinal double mass spectrometer system that has been described previously. This apparatus, shown schematically in Fig. 1, consists of a 2.54 cm radius, 90 degree magnetic sector mass spectrometer with electron impact ion source for production of... 

Fuj] Fujita, Y, Pagator, R.U., Hino, M., Azakami, T., Thermodynamic Investigation on Molten Cu-Ni-Fe Alloys by the Double Knudsen Cell-Mass Spectrometer System , J. Jpn. Inst. Met, 61(7), 619-624 (1997) (Experimental, Thermodyn., 12)... 

Figure 10.4 shows a schematic representation of the multidimensional GC-IRMS System developed by Nitz et al. (27). The performance of this system is demonstrated with an application from the field of flavour analysis. A Siemens SiChromat 2-8 double-oven gas chromatograph equipped with two FIDs, a live-T switching device and two capillary columns was coupled on-line with a triple-collector (masses 44,45 and 46) isotope ratio mass spectrometer via a high efficiency combustion furnace. The column eluate could be directed either to FID3 or to the MS by means of a modified Deans switching system . 

MAT 731 double-focussing mass spectrometer, a combined EI/FI/FD/FAB ion source and an AMD Intectra direct introduction system, has been previously described in detail (12). The samples were heated linearly from 50 C to 750 C at a rate of 100 K/min. In general, 35 FI mass spectra were recorded in the m/z 50-900 mass range. 

Figure 1.2 Principle of the operation of a mass spectrometer including sample introduction system, ion source, mass separator (e.g., a magnetic sector field) and ion detector system (e.g., double ion collectors for simultaneous measurements of two separated ion beams).

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