Artículos de revistas
Role of HOPG density of empty electronic states above vacuum on electron emission spectra induced by ions and UV photons
Fecha
2014-04Registro en:
Ferron, Julio; Vidal, Ricardo Alberto; Bajales Luna, Noelia; Cristina, Lucila Josefina; Baragiola, R. A.; Role of HOPG density of empty electronic states above vacuum on electron emission spectra induced by ions and UV photons; Elsevier Science; Surface Science; 622; 4-2014; 83-86
0039-6028
Autor
Ferron, Julio
Vidal, Ricardo Alberto
Bajales Luna, Noelia
Cristina, Lucila Josefina
Baragiola, R. A.
Resumen
We present results of secondary electron emission (SEE) induced by UV photons and low energy He ions interacting with a pristine and ion damaged surface of highly-oriented pyrolytic graphite (HOPG). A critical examination of the changes in the SEE spectra produced by the radiation damage allows us to identify the origin of the different features of the SEE spectra. In this way,we conclude that the lowenergy peak at ~3 eV is strongly determined by the structure of the (empty) HOPG density of states above vacuum level. In contrast the highenergy structure at ~14 eV could not be explained by such an argument but rather by exciton autoionization.