Secondary Ion Mass Spectrometry of Small-Molecule Solids at Cryogenic Temperatures. 3. Nitrogen Oxides

摘要

Secondary ion mass spectra of neat solids N2O, NO, N2O3, and N2O4 were measured as a function of the nature and energy of the primary ions (He+, Ne+, Ar+, Kr+, Xe+, 0.5-4.5 keV). All of the solids produced a rich variety of positive and negative secondary ions. Particularly striking is the abundance of cluster ions, observed above all for primary ions of large momentum. The elemental composition of the "elementary solvating units" generally does not agree with the molecular formula of the solid, suggesting that extensive ion-neutral and neutral-neutral chemistry occurs before the cluster ion reaches the mass analyzer. A qualitative model for these processes is proposed.