Comparison of mass spectra of different types of matrices

With secondary ion mass spectrometry it is possible to analyze the surface of the inorganic, organic samples and samples which are combinations of organic and inorganic compounds. Each of these types of samples has a different way of formation secondary ions - ionization mechanism. This paper deals with comparison of second cluster ions on an inorganic gold substrate with iron deposition, fragmentation and formation of organic molecules ions of cholesterol and a combination of different mechanisms for analyzing fingerprints with gunshot fumes. The spectra of gold (Au) were demonstrated preference ionization clusters with an odd number of atoms. In the spectra of cholesterol have been identified peaks arising deprotonation, cationization and loss of small functional groups. Such methods of ionization were applied in the analysis of fingerprints of gunpowder, where it was possible to detect species of ammunition even at low concentrations (authors)