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CuX clusters (X=Cr, Mn, Ni) studied by secondary ionic emission

Journal of Physics B: Atomic and Molecular Physics, ISSN: 0022-3700, Vol: 16, Issue: 4, Page: 671-675
1983
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  • Citations
    3
    • Citation Indexes
      3

Article Description

The authors discuss the mass spectra intensities of molecular ions Cu X (X=Cr, Mn, Ni) emitted from a (CuX) alloy bombarded by a primary ion beam. The results for CuCr and Cu Ni are taken from the literature. These intensities present a saw-tooth behaviour: they are larger for a given parity of n. According to the correspondence rule 'intensity stability' this phenomenon can be attributed to an alternation of the corresponding stabilities. Then, the authors adopt a quantum mechanical point of view and examine why the stabilities are larger for a given parity of n. In CuX ions the X 3d levels keep their atomic d population which is d for Cr and Mn, and d for Ni (this choice is discussed). The X 4s levels participate in the construction of the s band which is responsible for the stability of the cluster: Cr and Ni bring one electron and one s atomic function, Mn brings two electrons and one s atomic function. According to this simple scheme the s band is a closed shell and, therefore, the cluster is more stable, when the total number of atoms is odd for CuCr and Cu Ni, and even for CuMn. This agrees with the secondary ionic emission study (SIMS) results. The authors also discuss the change of Ni behaviour when its proportion in a Cu Ni cluster varies: it appears that the Ni valence configuration is 3d4s only when its proportion is small.

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