ATOM DYNAMICS ONPt,IrANDCuSURFACES: AN EXPERIMENTAL STUDY USING VARIOUS TECHNIQUES

Tien T. Tsong, Chonglin Chen, Tsu-Yi Fu and Yi-Ren Tzeng
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Tien T. Tsong: Institute of Physics, Academia Sinica, Taipei, Taiwan, ROC
Chonglin Chen: Institute of Physics, Academia Sinica, Taipei, Taiwan, ROC
Tsu-Yi Fu: Institute of Physics, Academia Sinica, Taipei, Taiwan, ROC
Yi-Ren Tzeng: Institute of Physics, Academia Sinica, Taipei, Taiwan, ROC

Surface Review and Letters (SRL), 1996, vol. 03, issue 02, 1259-1269

Abstract: Some metallic adsorbed atoms on fcc metal surfaces can exchange with substrate atoms well below the room temperature. For homogeneous systems, the atomic exchange is a mechanism for self-diffusion. For heterogeneous systems, it is a mechanism for point alloy formation of only the top surface layer but it will also induce self-diffusion. We present experimental evidence found from FIM, HREELS and LEIS studies. These experiments and their relations to available theories and molecular dynamic simulations of this phenomenon are also mentioned. In addition, we present evidence for the ascending motion of step edge atoms to the upper terrace for theIr(111)surface, and the result of a measurement of the potential barrier height of the ascending motion and the dissociation energy of step edge atoms to the lower terrace.

Date: 1996
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DOI: 10.1142/S0218625X96002278

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