Two-dimensional PSD spectra calculated from 1 × 1 μm AFM images (energies: 0.25 to 5 keV). Obtained after irradiation of the samples at different energies from 0.25 to 5 keV. The spectrum for the un-irradiated sample is also plotted for comparison.
Al-Harthi et al. Nanoscale Research Letters 2012 7:466 doi:10.1186/1556-276X-7-466