Desorption ionization of cesium iodide by Fourier transform mass spectrometry.
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Results of studies on the secondary ion mass spectrometry (SIMS) of Csl by Cs+ ion desorption ionization Fourier transform mass spectrometry (DI-FTMS) are reported. Owing to the relatively long time scale of the FTMS experiment, the anomalous cluster ion Intensity for the Cs(CsI)n+ cluster ions observed by Campana is very distinct. A second objective of this study was to evaluate the utility of ion ejection methods for enhancing the dynamic range of FTMS. While ion ejection does Improve the dynamic range of FTMS, care must be exercised to avoid translationally exciting other Ions which are present in the ion cell. Translational excitation of these ions can lead to collision-induced dissociation (CID). Finally, estimates of the secondary ion yield for the Cs- (CsI)13+ ion are given and used to estimate the sensitivity of DI-FTMS. 1985, American Chemical Society. All rights reserved.