Scattered ion yields from bimetallic crystal surfaces
For a number of bimetallic single crystal surfaces and ordered epilayers were investigated scattered ion yields. He+ and Ne+ ions in the energy range of 1-4.5KeV were used to study the systems CuAu, PdRu , AuRu, NiAL and FeAl. Choosing appropriate scattering conditions the contributions from the topmost first and second atomic layers can be separated. Comparison of the measured ion yields for different elements or with numerical simulations that do not include neutralization effects provides the possibility to identify relative ion survival probabilities for scattering from different layers of these surfaces. The rsults show large differences for various elements and emphasize the importance of the chemical nature of the first layer species for ion yields from second layer scattering. Au and Cu in the first layer cause a much higher neutralization rate than Al or Ru. Besides the relevance for neutralization processes these results are also important for quantitative analysis of alloy surface layers by low-energy ion scattering (LEIS).
Bibliographic Reference: Article: Nuclear Instruments and Methods in Physics Research B 157 (1999), 270-273
Record Number: 199911493 / Last updated on: 1999-10-22
Original language: en
Available languages: en