High yields of intact scattering are found for collisions of mass-selected Si±N clusters (N=5-24) against graphite and silicon surfaces, at impact energies of 0.5-10 eV/atom. This result indicates an unanticipated difficulty in forming bonds during the impact event. The reflected cluster fragments or emits an electron in patterns consistent with gas-phase energetics, and analysis of fragmentation rates specifies an internal energy content of 12-26 percent of the impact energy, depending on cluster size, the surface, and surface temperature. Reactive processes, such as sticking or adhesion, may still dominate at lowest and highest energies.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry