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STUDIES IN HIGH PRESSURE MASS SPECTROMETRY (MS)
Abstract
High pressure mass spectrometry has been used to study various phenomena involving gaseous ions. A major portion of this work dealt with the design and development of a new hybrid drift tube-ion source. It employs coaxial geometry between the electron entrance aperature and the direction of ion drift and uses two field shaping rings to produce parallel equipotential lines throughout the ion drift region. Ion residence time distributions determined for this source are in good agreement with calculated residence time distributions; thus the source can be used to measure ion mobilities. The temperature of this ion source can be varied from 160-470 K. The well-defined electric fields in the ion source along with the temperature variability make this source particularly suitable for the study of ion-molecule equilibria and ion-molecule association reactions. The coaxial geometry also allows the determination of the initial spatial distribution of ion formation inside the ion source as a function of the ionizing electron energy; it is obtained by correlating the residence times of the ions with their point of formation. Integrating the spatial distribution to the point within which a given fraction of the ionization has occurred yields the "ionization range" R(,i) which is similar to the range measured by electron penetration through absorbers.
Subject Area
Chemistry
Recommended Citation
ILLIES, ANDREAS JOACHIM, "STUDIES IN HIGH PRESSURE MASS SPECTROMETRY (MS)" (1982). ETD collection for University of Nebraska-Lincoln. AAI8306486.
https://digitalcommons.unl.edu/dissertations/AAI8306486