Electron capture negative ion mass spectroscopy (ECNIMS) has been
performed on environmental chemicals and explosives. A trochoidal electron
monochromator interfaced to a gas chromatograph and a quadrupole mass
spectrometer allows compounds to be studied by this method. The method employed
here differs from standard ECNIMS in that no reagent gas is used to moderate
electron energies.
Several explosives were analyzed using this system, as were chlorinated
compounds obtained from the lipid fraction of Arctic trout muscle. A miniaturized
version of the system would be advantageous as a portable apparatus for field use.
Among the required modifications would be the installation of cylindrical permanent
magnets to replace the Helmholtz coils used for generating the magnetic field for the
monochromator. Tests suggest that the trochoidal electron monochromator component
of the system can be reduced in volume by a factor of 200 without an appreciable loss
of energy resolution. / Graduation date: 1994
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36761 |
| Date | 30 June 1993 |
| Creators | Sonnen, Steven J. |
| Contributors | Kocher, Carl A. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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