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Extra resources for Advanced Mass Spectrometry. Applications in Organic and Analytical Chemistry
N On the other hand, the relationships between the analysing fields - magnetic (B) and electric (E) sector - are fundamentally different. The possible radii %agnet * el. sector of the flight path are fixed by the construction of the instrument. Therefore, only a certain type of ion is focused on the detector at a precisely defined size of the analysing fields. The momentum J * mv corresponds to a definite quantity of B. and the electric field Ε is chosen relative to the kinetic energy W = L mv^.
Obviously the new methods do not provide a complete picture regarding the structural elucidation of ions, but, combined with conventional methods like accurate mass measurements and labelling experiments they open new ways for the detection of origin, fate, and structure of ions. —C 50 Analytical Chemistry Consequences B/E = constant linked scan . Fig. 1 . Comparison of the resolving power of a DADI/MIKE -, collisional activation -, and B/E linked scan spectrum of the molecular icn of 3-methyl-4-phenyl-2-butanone.
1a Accelerating voltage scan (AVS). io raise Vi . f ) . s W* = f . This increase in kinetic energy raises the momentum J = mv simultaneously: 37 Hardware That means that the momentum J * of the product ion m equals the momentum of the original main ion beam and therefore the product ion m can pass the magnetic sector as well. By continuous increase of the accelerating voltage every precursor ion, generating a particle of mass m , can be detected. The mass of a precursor can be calculated according to equation X (Fig.