AN ELECTRONIC AND COMPUTER SYSTEM FOR AN AUTOMATED ATOM PROBEReport as inadecuate




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Abstract : An electronic system which controls voltages, measures times, calculates masses and displays spectra has been applied to the VG Scientific FIM100 atom probe. The rate of ion desorption is automatically controlled by voltage adjustments which occur when the ion rate falls outside preset limits. Simple instrument functions, for example, use as an IAP, can be carried out with or without computer control, and manual voltage control is available at all times. The experimental data are stored on a disc and can be output later and re-analysed using the same program. Other real time screen displays include plots of changes of composition with depth, sequences such as the mass to charge ratio of successive ions or related quantities -ladder diagrams-, or the comparison of two spectra where both may be continually updated or one may be a stored spectra taken at an earlier stage of the experiment. Sequences can be printed out and the spectra and other diagrams can be plotted. The high rate of ion desorption combined with analysis in real time provides a very efficient system.





Author: A. Cerezo T. Godfrey A. Moore G. Smith

Source: https://hal.archives-ouvertes.fr/



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