Advanced Mass Spectrometry: Applications in Organic and by Urs P. Schlunegger

By Urs P. Schlunegger

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The product ion mt, therefore, has a lower momentum (J < ^l) than m^, and is able to pass the magnetic sector only at a reduced field strength. Here again, the same phenomenon is experienced as with a single focusing magnetic mass spectrometer. Thus, the relatively enlarged signals of the product ions cannot be clearly attributed to a definite precursor. 2 Detection of origin and fate of ions in the first fieldfree region. As noted above, a product ion, generated after acceleration into the first field-free region, contains too little momentum and insufficient kinetic energy to pass the following electric and magnetic sectors under the conditions of the main ion beam.

By this procedure an ion is characterised in two directions which enables a solution of the above-mentioned equation with two unknown quantities (III). To recapitulate the most important formulae in this connection, are reviewed below (Table 1 ) . An ion is influenced accordingly in the different sectors proportional to the following criterion: s n 30 Hardware TABLE 1 influence in proportion to accelerating field magnetic sector electric sector accelerating voltage = V momentum J = mv kin. energy W.

Therefore, in the following paragraphs there follows a discussion of the practical possibilities of the different mass spectrometers and of the conditions for an unequivocal attainment of fragment genesis. 1 Single-Focusing. 1 Magnetic mass spectrometers. Occasionally so-called metastable peaks are found in mass spectra obtained by singlefocusing magnetic instruments. The cause of this is discussed below. An ion of the mass m^ is accelerated to a certain velocity νχ in the ion source. According to equation II and IV this ion m\ follows a flight path of radius r^ in the magnetic field corresponding to r M If after the acceleration the ion m£ decomposes into the product ion mj and a neutral particle Π 1 3 , the kinetic energy is indeed separated relative to the masses, but mi retains the velocity νχ of the precursor ion m^.

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