Abstract
This paper describes an experimental study on the influence of the kinetic energy in surface ionization, using Ni and ReO2 surfaces and fast toluene and piperidine molecules. These accelerated molecules in seeded supersonic molecular beams expanded from a nozzle and were suddenly brought to interact with surfaces by collision.
Results were obtained as a function of incident kinetic energy and system parameters, indicating that kinetic energy causes the surface ionization to increase drastically above threshold energy. The threshold kinetic energy was 3.5 and 3.4 eV for toluene/Ni and piperidine/ReO2, respectively.
