Use this URL to cite or link to this record in EThOS:
Title: Mixture analysis by metastable mapping
Author: Farncombe, Martin
ISNI:       0000 0001 3457 7148
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1983
Availability of Full Text:
Access from EThOS:
Access from Institution:
This thesis describes a technique of practical use for the analysis of mixtures and the determination of organic ion structures which relies on the study of metastable and collision-induced decompositions which occur in the first field-free region of a forward-geometry double-focussing mass spectrometer. The technique, which is known as metastable mapping, works by scanning the magnetic field of the mass spectrometer in the usual way and decreasing the electric sector field slightly at the end of each magnetic field scan. The data are collected by a standard commercial data system and may be processed to produce simulated linked scans or a 'map' of parent ion mass against daughter ion mass. A theoretical explanation of the shapes of the peaks is given and the resolution, sensitivity, and susceptibility of the technique to artifact peaks are discussed. The metastable maps of a number of compounds and mixtures are presented to illustrate the use of the technique for mixture analysis and the differentiation of isomeric ions. A study of some ions scattered off the optical axis of the mass spectrometer is also discussed. A computer program, based on the statistical method of factor analysis, which can be used to deconvolute the mass or carbon—13 NMR spectra of mixtures has also been developed. A description of the program, which has been implemented on a small laboratory microcomputer is given and some results are presented which show the practicability of the technique.
Supervisor: Not available Sponsor: Science and Engineering Research Council ; Imperial Chemical Industries Ltd ; University of Warwick
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QD Chemistry