By Urs P. Schlunegger

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This would be equivalent to a precursor spectrum of a special ion mass. This, however, raises the question as to what ratio the field strengths of the magnetic and the electric sector have to be diminished by. 6 Fig. 95 137 28—» Μ - C H 165 45 OC H — Μ- 2 2 4 5 Accelerating voltage scan (AVS): spectrum of m/z 120 generated from 4-amino-benzoic acid ethyl ester (compare Fig. 14) with corresponding V. and m. values. (Varian MAT CH-5DF), 1 1 39 Hardware W, I β 1/2 m. v? l l eV- β β 1 constant. From equations I and V the following relationship can be deduced: /2 m v l 2 » 1/2 e E r » eV £ Thus, the conditions can be deduced by which an ion of mass m is characterised: (xi) By analogy the criterion for the passage of an ion of mass m across the magnetic sector can be deduced.

35 Hardware (A) \J\JAJ Fig. 15 Comparison of DADI/MIKE spectrum (A) with a collisional activation DADI/MIKE spectrum (B) of the same precursor ion (Μ*· of 3-ethyl-4-phenyl-2-butanone) with identical amplification of the signals. (Varian MAT CH-5DF). Collision gas pressure was chosen so that the signal of the precursor ion diminished by 50% X : rearrangement reaction product, an excited ion. 2 Mass spectrometers with conventional order of fields (Nier-Johnson geometry). The type of arrangement involving acceleration, electric analyser, magnetic analyser is especially useful in high resolution mass spectrometers.

This fact is of decisive importance because it clearly shows the difficulties involved in the interpretation of mass spectra. The signal at m I ζ does not indicate from which metastable ion it is originating. It is only possible to calculate the proportion of mass between metastable ions and product ions (m^/mi) not the mass of the metastable ion itself. In the previously mentioned equation with two unknown quantities (III) the determinant for the masses is still missing; neither m£ nor m^ is defined.

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