MECHANISMS FOR ELECTRON EMISSION IN COLLISIONS OF SLOW IONS WITH INSULATORS

R BARAGIOLA; C. DUKES; G. RUANO; R. VIDAL; J. FERRÓN

Gatlinburg, Tennessee

Workshop; 18th International Workshop on Inelastic Ion-Surface Collisions (IISC-18); 2010

Physics Division, Oak Ridge National Laboratory

We will report on measurements of energy spectra of electrons emitted from the surfaces of aluminum fluoride, lithium fluoride and water ice by low-energy noble gas ions. The spectra show interesting structure that can be isolated by factor analysis [1] of the projectile energydependence. We will discuss different excitation mechanisms and the role of excitons [2,3] andautoionizing states [4].The research seeks the understanding of basic physics of inelastic ion-surface collisions and will be presented in the context of applications to plasma devices and electrostatic charging of astronomical surfaces such as lunar and asteroidal dust, planetary rings particles and interstellar grains.2. REFERENCES[1] N. Bajales, S. Montoro, E. C. Goldberg, R. A. Baragiola, and J. Ferrón, Surface Sci. Lett. 579, L97 (2005).[2] P. Riccardi, M. Ishimoto and R.A. Baragiola, Surface Sci. Lett. 571, L305 (2004).[3] N. Bajales, L. Cristina, S. Mendoza, R.A. Baragiola, E.C. Goldberg and J. Ferrón Phys. Rev. Lett. 100227604 (2008).[4] C. D. Wilson, C. A. Dukes and R. A. Baragiola,Phys. Rev. B 63, 1101 (2001)