Core-level spectroscopy of clean and adsorbate-covered Ta(100)

C. Guillot; P. Roubin; J. Lecante; M. C. Desjonquères; G. Tréglia; D. Spanjaard; Y. Jugnet

doi:10.1103/PhysRevB.30.5487

Core-level spectroscopy of clean and adsorbate-covered Ta(100)

C. Guillot, P. Roubin, J. Lecante, M. C. Desjonquères, G. Tréglia, D. Spanjaard, and Y. Jugnet

Phys. Rev. B 30, 5487 – Published 15 November 1984

Abstract

We present a theoretical and experimental study of the surface core-level shifts on Ta(100), clean and H- or O-covered. For the clean surface, the observed core-level shift is very large for surface atoms (740 meV) whereas it remains small for the first-underlayer atoms (140 meV). This is in complete agreement with our theoretical predictions. In the presence of adsorbates, the calculations give the right order of magnitude of the shifts, if we assume that O and H atoms adsorb at centered sites on Ta(100). This last result is surprising since it is well known that H atoms occupy a bridge site on W(100).

Received 24 February 1984

DOI:https://doi.org/10.1103/PhysRevB.30.5487

Authors & Affiliations

C. Guillot, P. Roubin, J. Lecante, and M. C. Desjonquères

Service de Physique des Atomes et des Surfaces, Centre d'Etudes Nucléaires de Saclay, F-91191 Gif-sur-Yvette, France and Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, F-91405, Orsay, France

G. Tréglia and D. Spanjaard