| Abstract: | Secondary ion mass spectrometry for oligopeptides, such as tri-tetra-, penta- and hexapeptides, and bioactive peptides, are presented. Quasimolecular ions and cationized molecules were observed, together with many kinds of fragments, which were helpful in structural assignments. Secondary ion mass spectrometry did not prove to be dependent on temperature. Thermal migration of samples on a surface was observed at high temperature. Secondary ion mass spectra obtained with a silver substrate and an aluminium substrate are compared. |
