Electronic study of SrTiO3(001) surfaces by photoemission

A572 34

Surface Science 162 (1985) 34-38 North-Holland, Amsterdam

ELECTRONIC

STUDY

OF SrTiO3(001 ) SURFACES

BY PHOTOEMISSION Bernhard CORD

and Ralf COURTHS

Fachbereich Experimentalphysik 11.2, Universitiit des Saarlandes, D-6600 Saarbr~cken, Fed Rep. of Germany

Received 1 April 1985; accepted for publication 29 April 1985 Defect rich and stoichiometric surfaces of SrTiO3(001) prepared by argon-ion bombardment and annealing in UHV or in oxygen atmosphere have been investigated by photoelectron spectroscopy, LEED and AES. Via core level shifts (Ti 3p level) surface Ti ions and Ti ions in different charge states have been identified and are set in correlation to characteristic defect-related gap states.

39

Surface Science 162 (1985) 39-45 North-Holland, Amsterdam

SYNCHROTRON RADIATION INVESTIGATION OF H : G a A s ( I I 0 ) C. A S T A L D I , L. S O R B A , C. R I N A L D I , S. N A N N A R O N E

R. M E R C U R I

and

Dipartimento di Fisica, Unicersiti7 di Roma "La Sapienza'" 1-00185 Roma, ltaly and Gruppo Nazionale di Struttura della Materia

and C. C A L A N D R A Dipartimento di Fisica, Universith di Modena, Via Campi 213A, 1-41100 Modena, Italy and Gruppo Nazionale di Struttura della Materia Received 1 April 1985; accepted for publication 4 April 1985

The H:GaAs(110) was studied by ultraviolet photoemission. The analysis of tne spectra show that hydrogen chemisorbs on both Ga and As along ideal dangling bond direction. At the same time, because of the strong H-surface interaction, the H causes the removal of As.

aurface Science 162 (1985) 46-50 North-Holland, Amsterdam

46 CORE

LEVEL

SPECTROSCOPY

OF

THE L O W

INDEX

FACES

OF

TANTALUM C. G U I L L O T , D. C H A U V E A U , P. R O U B I N , J. L E C A N T E a n d M . C . D E S J O N Q U E R E S Service de Physique des Atomes et des Surfaces, CEN-Saclay, F-91191 Gif-sur-Yvelte, France and LURE, B&timent 209C, F-91405 Orsay, France

and