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

By Urs P. Schlunegger

ISBN-10: 0080238424

ISBN-13: 9780080238425

Show description

Read or Download Advanced Mass Spectrometry. Applications in Organic and Analytical Chemistry PDF

Similar organic books

Carbon Fibre Composites

In Carbon Fiber Composites, the reader is brought to a variety of carbon fiber composites, together with polymer-matrix, steel matrix, carbon-matrix, ceramic-matrix and hybrid composites. the topic is tested in an educational model, in order that no earlier wisdom of the sector is needed. unlike different books on composites, this publication emphasizes fabrics instead of mechanics, because the prominence of composite fabrics has resulted from their elevated presence in purposes except constitution.

Terpene: Aromen, Düfte, Pharmaka, Pheromone

Einleitend werden die Bedeutung der Terpene, ihr als Isopren-Regel bekanntes Bauprinzip und ihre Biogenese skizziert. Es folgt eine nach Anzahl der Isopren-Einheiten und Grundskeletten geordnete Übersicht der bekanntesten Terpene, ihres Vorkommens in Pflanzen und anderen Organismen sowie ggf. ihrer biologischen und pharmakologischen Wirkungen.

Persistent Organic Pollutants: Environmental Behaviour and Pathways of Human Exposure

Continual natural pollution (POPs) remain the topic of shock among the general public, in addition to the clinical and policy-making groups. those issues are exemplified via the foreign efforts co-ordinated via the United countries' atmosphere Programme and the +Economic fee for Europe.

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

Sample text

Today, these questions can be studied more directly. The fate of the ion species of interest can be determined by systematic measurement. This has been already demonstrated in the case of l-phenyl-3-methyl-butanone (see Chapter 1 ) . There, the question was whether only one or both theoretically possible methyl cleavages occur after electron impact ionisation. This example showed that the origin and fate of ions could be detected in the case of molecular ions as well as of fragment ions. If the decomposition of consecutive ions is followed along the ion generations, the fragmentation pathways of the relative molecule concerned or of its fragments are directly obtained.

Energy W. = m v2 km γ J=mv=eBr Μ velocity ν ν - I J W . = —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.

If the electric field is ldecreased trom Ε ^ · ^ " b to zero, then all product ions generated by metastable decompositions are focussed successively on the detector. Here again it is necessary to ask if such an energy spectrum can prove a fragment genesis. As the ion separation only resulted according to the kinetic energy W ] ^ it can be concluded that a signal in the energy spectrum may, in principle, represent any number of ions of different mass and velocity. Again, only one quantity of the equation with two unknown quantities (III) is determined and therefore the equation is unsolvable.

Download PDF sample

Rated 4.81 of 5 – based on 22 votes