Study of fluorine contamination on MgO(100) surfaces

✍ Scribed by I Colera; E Soria; J.L de Segovia; R González

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 319 KB
• Volume: 52
• Category: Article
• ISSN: 0042-207X
• DOI: 10.1016/s0042-207x(98)00206-1

✦ Synopsis

The ¯uorine contamination on MgO(100) surfaces is studied using Electron Stimulated Desorption (ESD) and Auger Electron Spectroscopy (AES). While Ar + ion sputtering is very eective to clean the carbon contamination on the surface, the ¯uorine content does not signi®cantly decrease. Thermal treatments of the sample considerably increase the F surface concentration due to its diusion from the bulk to the surface. Heating the sample at 700 K simultaneously with H 2 O exposure produces a decrease in the ¯uorine signal. The ion kinetic energy distribution of the F + ion shows two peaks at 2.4 and 5 eV. The threshold energy of the F + ion desorption is at 60 eV.