Abstract
The application of ISS in order to investigate the surface composition of a NiO—MoO3 /γAl2 O3 system is discussed. It is found that the experimental conditions and sample conditioning (in particular, energy of the probe ion, time of 4 He+ sputtering, time of degazing) influences the intensity ratio of the elements leading to difficulties in the description of the surface in terms of atomic distribution. Atom shielding effects which origin comes from different atomic radii of the species involved in this study and some contamination are supposed to be the origin of the difficulties in interpretation. Considerations about the shielding effect lead us to the conclusion that there is no bilayer Mo—Ni—Al on our sample.
Published Version
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