By Urs P. Schlunegger
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Additional resources for Advanced Mass Spectrometry. Applications in Organic and Analytical Chemistry
For this purpose we are, as much as ever, left with DADI/MIKE-spectrometry instruments with reversed geometry. 2a (B/E « constant linked scan). e. is diminished relative to the precursor ion. The momentum, and kinetic energy of the precursor ion mj are fixed by conditions which are held constant in the ion source: M = n^v^ and Therefore, a product ion can only have the momentum: Consequently, the strength of the magnetic field must be diminished by a factor f=ni2/m-|_ in order to enable the product ion m* to pass the magnetic sector.
Mass numbers, corresponding to the ions of fragmentation pathways, and thus belonging to different generations are naturally separated by arrows pointing to the right; an example from Fig. 21 is: m/z 288 + 273 •+ 137 -> 96. CHAPTER 6 STRUCTURAL AND MECHANISTIC APPLICATIONS New methods are usually first tested to see whether they have any advantages over previous methods. Only then are attempts made to apply the new method to the study of unsolved problems. This trend can also be observed in regard to the methods in use for the detection of fragment origin in the mass spectrometer.
The type of arrangement involving acceleration, electric analyser, magnetic analyser is especially useful in high resolution mass spectrometers. In principle, an energy filter (electric sector) is used to filter most possible monoenergetic ions out of the ion beam, in order to separate them relative to mass in the magnetic sector. If now a decomposition of a metastable ion mj in the second fieldfree region occurs, the kinetic energy of the precursor m^ decomposes relative to the masses. 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.
Advanced Mass Spectrometry. Applications in Organic and Analytical Chemistry by Urs P. Schlunegger