Maja Müller

Sputtering of fullerene by noble gas ions at high fluences

Abstract Noble gas ions have been implanted into fullerene in the solid state up to fluences which far exceed the molecular destruction threshold. The corresponding depth profile peaks in Rutherford backscattering experiments move strongly towards the surface signal with increasing fluence. This suggests a high degree of target erosion due to collisional sputtering. One consequence of this process can be an interesting and basic effect on the nature of the fullerene destruction products.

Rutherford backscattering of laterally heterogeneous structures: The determination of radial density distributions in ion tracks in collodium

Abstract Energy loss spectrometry of ions transmitted through matter is hitherto known as a tool to probe the geometrical dimensions and/or density distributions within a given small sample in one, two, or even three dimensions. We show here that energy loss spectrometry can also be applied to determine the radial density distribution of latent ion tracks in polymers. First test experiments in Rutherford Backscattering (RBS) geometry are reported, where 2 MeV protons and α particles are used to probe the radial density distribution of self-created latent ion tracks in collodium films. Track overlapping leads to a rough surface structure which smoothens out with increasing irradiation dose.

Three-dimensional implantation distribution of lithium implanted into pyrographite, as revealed by solid state tomography in combination with neutron depth profiling

Abstract We have studied the three-dimensional distribution of 2.5 MeV Li implanted into pyrographite at room temperature by means of modified tomography in combination with neutron depth profiling. Our new findings essentially reconfirm earlier results (D. Fink et al., J. Appl. Phys. 58 (1985) 668 [1]; Radiat. Eff. and Def. in Solids 114 (1990) 21 [2]) which indicated the presence of some radiation-enhanced mobility of the implanted lithium. This diffusion is anisotropic. It preferentially proceeds into the radial direction.