Surface core level spectroscopy of the Pt25Co75 (110) and (100) alloy surfaces

J. Thiele; C. Guillot; N.T. Barrett; R. Belkhou; P. Dolle; R. Baudoing-Savois

doi:doi:10.1051/jp4:1994920

Issue		J. Phys. IV France Volume 04, Number C9, Novembre 1994 Proceedings of the European Symposium on Frontiers in Science and Technology with Synchrotron Radiation


Page(s)		C9-135 - C9-139
DOI		https://doi.org/10.1051/jp4:1994920

Proceedings of the European Symposium on Frontiers in Science and Technology with Synchrotron Radiation

J. Phys. IV France 04 (1994) C9-135-C9-139
DOI: 10.1051/jp4:1994920

Surface core level spectroscopy of the Pt₂₅Co₇₅ (110) and (100) alloy surfaces

J. Thiele^{1, 2}, C. Guillot^{3, 2}, N.T. Barrett^{3, 2}, R. Belkhou², P. Dolle⁴ and R. Baudoing-Savois⁴

¹ DRECAM/SRSIM CE-Saclay, 91191 Gif-sur-Yvette cedex, France
² LURE, Bâtiment 209D, Université Paris Sud, 91405 Orsay cedex, France
³ DRECAM/SRSIM CE-Saclay, 91191 Gif-sur-Yvette cedex, France.
⁴ Laboratoire de Cristallographie, CNRS, BP. 166, 38042 Grenoble, France

Abstract
Core level photoemission spectroscopy of the Pt 4f_7/2 level is used to investigate the surface and bulk Pt environments in the disordered alloy Pt₂₅Co₇₅. For the (110) face no Pt is observed at the surface, and only a single Pt bulk site is identified with a chemical shift of 250meV. For the denser (100) face the same bulk site is observed together with a surface peak, corresponding to a surface layer with Pt enrichment. The chemical shift at the surface is weaker than in the bulk.