Carter, David Michael; (1991) The evaluation and applications of a glow discharge mass spectrometer ion source. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

Glow discharge ion sources have been used with mass spectrometers since 1970 for the qualitative and quantitative determination of impurities in a wide range of host materials, both electrically conducting and insulators. The technique gives a full elemental analysis for metals, alloys and more recently for semiconductors. For instance in the latter field, sensitivity compares favourably with other techniques such as localised vibrational mode Fourier transform infra-red spectroscopy and with spark-source mass spectrometry. However, the use of glow discharge mass spectrometry for the analysis of chemical compounds is largely inchoate. A glow discharge ion source has been built which fulfils the initial concept of elemental analysis but which has two additional roles: the source will produce strong soft ionisation mass spectra of selected organic and organometal1ic compounds and can be used in both the positive and negative ion modes; using a hollow probe its third application is in liquid chromatography mass spectrometry. The triple electrode ion source, which can be thermoelectrically cooled, is mounted in a high resolution mass spectrometer with a data system.

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