The Effect of Energetic Electrons on the Secondary Ion Emission
There have been two main mechanisms proposed for ionization processes in SIMS; they are the electronic excitation by atomic collisions  and the atom-surface resonant electron tunneling [2,3]. A direct evidence of the electron tunneling has recently been reported , and its delicate experiment was a rather academic task, adjusting the relative position between the Fermi-level and vacuum level (or changing the work function of sample surface). In the present work, we have tried to perform the experiments under conventional conditions which could meet the requirement for traditional utilities of SIMS.
KeywordsEnergy Spectrum Work Function Energetic Electron Electron Tunneling Contact Potential Difference
- 3.J. K. Norskov and B. I. Landqvist: Phys. Rev. Lett. B19, 5661 (1979)Google Scholar
- 6.P. Sigmund: “Sputtering by Bombardment Particle I” R. Behrisch ed. p.9 (Springer, Heidelberg 1981)Google Scholar
- 7.H. W. Drawin and P. Felenbok: “Data for Plasmas in Local Thermodynamic Equillibrium” (Gauthier-Villars, Paris 1965)Google Scholar