Download e-book for kindle: Advanced Mass Spectrometry. Applications in Organic and by Urs P. Schlunegger

By Urs P. Schlunegger

ISBN-10: 0080238424

ISBN-13: 9780080238425

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Extra info for Advanced Mass Spectrometry. Applications in Organic and Analytical Chemistry

Example text

In addition, some results of accurate mass determination, mass numbers and structural elements are recorded horizontally at the appropriate mass level. 1(b)) in the same way. The mass differences, often useful for interpretation, are added vertically to the appropriate transitions. 2 Definitions To make it easier to discuss the applied examples, the conceptions used are now defined. All product ion ("daughter ions"), generated directly from one ion species constitute an "ion generation". For instance, it can be clearly seen that the ion at m/z 178 (See Fig.

Mv km 2 w 2eV = -*·*> j2meV m = eV The comparison in Table 1 clearly shows the direct relationship of the three criterion v, J and W ^ £ to each other. Moreover it is obvious that the velocity v, taken up by the ions in the accelerating field V, does not depend upon the geometry of the instrument. The construction and the function of the ion source and the built-in accelerating field are of no importance. It only has to produce ions of smallest possible distribution of kinetic energy, and momentum, respectively.

To summarize the features of the new mass spectrometric procedures it can be stated that they represent additional tools for the analytical chemist. They speed up the acquisition of information about the origin and fate of ions in comparison to conventional mass spectrometry. They also generate more analytical data and in the case of collisional activation provide new information about ion structures. 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.

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


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