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

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°, 45°, and 120° at fluences in the range of 2×${10}^{13}$ to 4×${10}^{15}$ 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.