Dollinger, Günther; Boulouednine, M.; Bergmaier, Andreas; Faestermann, Thomas
Dokumenttyp:
Zeitschriftenartikel / Journal Article
Titel:
Nonequilibrium charge states of recoil ions in high resolution elastic recoil detection analysis
Zeitschrift:
Nuclear Instruments and Methods in Physics Research Section B
Heftnummer:
136-138
Jahr:
1998
Seiten von - bis:
574-578
Sprache:
Englisch
Stichwörter:
Boron compounds ; Electron energy levels ; Electrostatics ; Graphite ; Spectrographs ; Thin films, Elastic recoil detection analysis (ERDA) ; Electrostatic spectrographs ; Magnetic spectrographs, Ion beams
Abstract:
The measured profiles of a high resolution elastic recoil detection (ERD) analysis utilizing electrostatic or magnetic spectrographs may contain artefacts if only one charge state is measured. This effect is demonstrated by the analysis of 31.8 MeV 12Cq+ recoil ions of different charge states q+ scattered from a pure graphite sample using 60 MeV 58Ni8+ ions at a scattering angle of 15° and by the analysis of a thin BN film. The primary charge state distribution obtained from scattering events very near the surface significantly deviates from the equilibrium one which is measured for carbon ions scattered deeper than 1017 at/cm2 below the surface. Charge exchange cross sections between the main charge states are obtained analysing the depth dependent charge state distributions. «
The measured profiles of a high resolution elastic recoil detection (ERD) analysis utilizing electrostatic or magnetic spectrographs may contain artefacts if only one charge state is measured. This effect is demonstrated by the analysis of 31.8 MeV 12Cq+ recoil ions of different charge states q+ scattered from a pure graphite sample using 60 MeV 58Ni8+ ions at a scattering angle of 15° and by the analysis of a thin BN film. The primary charge state distribution obtained from scattering events ve... »