Influence of nuclear track potentials in insulators on the emission of target Auger electrons

Abstract

The angle, energy, and fluence dependence of electron emission following the interaction of normally incident 100-MeV ${\mathrm{Ne}}^{9+}$ ions with thin polypropylene foils and 170-MeV ${\mathrm{Ne}}^{7+}$ projectiles with Mylar foils has been investigated experimentally. Spectra were taken for electron ejection angles of 0\ifmmode^\circ\else\textdegree\fi{}, 45\ifmmode^\circ\else\textdegree\fi{}, and 120\ifmmode^\circ\else\textdegree\fi{} at fluences in the range of 2\ifmmode\times\else\texttimes\fi{}${10}^{13}$ to 4\ifmmode\times\else\texttimes\fi{}${10}^{15}$ ions/${\mathrm{cm}}^{2}$. A fluence-dependent carbon KLL Auger energy shift of up to 68 eV was observed. Model calculations for the nuclear track potential are consistent with the experimental findings.