No abstract

Auger spectra from highly insulating samples (AI,O, , Si,N,) are collected in a gaseous environment. It is demonstrated that the build-up of negative surface charge can be reduced considerably under suitable conditions. It is proposed that the decharging of the surface is initiated by Auger neutralization of the ions formed in the gaseous environment in coUisioas with the primary keV electrons.

No abstract

No abstract

lon-chromatography, a relatively new technique in a nal yti cal chemistry, has already shown great promise toward solving complex trace analysis problems, in particular the speciat ion and quantitation of allion~. It is especially attractive to the fi e ld of microanalysis. The method of sample preparation, however, is (Tucial in order to realize this capac it y. Existing microanalytical methods nearly always must be modified to be compatible with ion-chrof~latugraphy, and often, more extensive sample cleanu p is required than is needed for "s ingl e species" methods. These cons id e rations have been applied to the determination of ch lorid e and bromide in waste oil , and to the analysis of oys ter tissue. Pretreatment with polystyrene resin and ion-exchange resin is discussed.