Charakterisierung eines metastabilen He-Atom-Duesenstrahls und Streuung metastabiler He-Atome an einer NiO(100)-Spaltflaeche und einer Cu(100)-Oberflaeche

The strong electronic interaction between electronically excited metastable helium atoms (He"*) and a surface leads to a high deexcitation probability upon impact due to charge transfer. The probability that a metastable atom survives the scattering process depends sensitively upon the overlap of the orbitals of the metastable atom and the electronic states at the surface. In the current study the potentials and limits of scattering of metastable atoms for the investigation of surfaces are determined. For this purpose the interaction between metastable He 2"3S_1 atoms and different insulator and metal surfaces was investigated for the first time with a high angular and energy resolution through the application of a new state of the art scattering apparatus. (orig.)SIGLEAvailable from FIZ Karlsruhe / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman