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Secondary electron emission changes due to metal monolayer adsorption
A85 Surface Science 138 (1984) 181-190 North-Holland, Amsterdam SECONDARY
ELECTRON
MONOLAYER C. A R G I L E ,
181 EMISSION
CHANGES
DUE TO METAL
ADSORPTION
M.-G. BARTHES-LABROUSSE
and G.E. RHEAD
Laboratoire de Physico-Chimie des Surfaces (ERA 313), ENSCP, Unioersitd Pierre et Marie Curie, 11 Rue Pierre et Marie Curie, F-75005 Paris, France Received 14 July 1983; accepted for publication 3 November 1983 Changes in secondary emission during the adsorption of lead on copper (111) and (100) surfaces, followed by monitoring the crystal current (SEECC technique), are compared with changes in the work function as well as with variations in the Auger signals. The work function variation for the (100) face exhibits a sudden change that may be due to a transition of the adsorbate from a 1D (atomic chain) type of structure to a 2D structure. The secondary emission changes are not explained entirely by the work function variations; there are also effects that are correlated with changes in adsorbate structure and which are probably due to diffraction at the surface.
Surface Science 138 (1984) 191-202 North-Holland, Amsterdam POLARIZED
ELECTRON
ADSORBATE
COVERED
DIFFRACTION
191 FROM
CLEAN AND
Fe(110)
J. K I R S C H N E R lnstitut far Grenzflitchenforschung und Vakuumphysik, Kernforschungsanlage Jiilich, Postfach 1013, D - 5170 Jiilich, Fed. Rep. of Germany Received 16 August 1983; accepted for publication 3 November 1983
Intensity and spin polarization of the (0,0) beam from Fe(ll0) have been measured for the clean surface and for a coverage of up to a quarter of a monolayer of oxygen and sulfur. By the choice of a particular geometry spin-orbit coupling effects are eliminated, so that pure exchange scattering is observed. The energy ranges from - 1 to - 100 eV; polarization of more than 20% is observed at low energies, From the comparison of the results for clean and adsorbate covered surfaces it is concluded, that the adsorption of O and S in small amounts does not generate a "magnetically dead" surface layer.
Surface Science 138 (1984) 203-210 North-Holland. Amsterdam
203
THE ROLE OF RECOIL ATOMS IN ION EXCITED AUGER ELECTRON EMISSION FROM SINGLE CRYSTALS V . U . K I T O V a n d E.S. P A R I L I S Arifov Institute of Electronics, Tashkent, USSR Received 9 May 1983; accepted for publication 23 September 1983 The recent experiment by N. Benazeth seems to prove the theoretical prediction of orientational anisotropy of ion excited Auger electron emission. But in the experiment, the Auger electron
ELECTRON
MONOLAYER C. A R G I L E ,
181 EMISSION
CHANGES
DUE TO METAL
ADSORPTION
M.-G. BARTHES-LABROUSSE
and G.E. RHEAD
Laboratoire de Physico-Chimie des Surfaces (ERA 313), ENSCP, Unioersitd Pierre et Marie Curie, 11 Rue Pierre et Marie Curie, F-75005 Paris, France Received 14 July 1983; accepted for publication 3 November 1983 Changes in secondary emission during the adsorption of lead on copper (111) and (100) surfaces, followed by monitoring the crystal current (SEECC technique), are compared with changes in the work function as well as with variations in the Auger signals. The work function variation for the (100) face exhibits a sudden change that may be due to a transition of the adsorbate from a 1D (atomic chain) type of structure to a 2D structure. The secondary emission changes are not explained entirely by the work function variations; there are also effects that are correlated with changes in adsorbate structure and which are probably due to diffraction at the surface.
Surface Science 138 (1984) 191-202 North-Holland, Amsterdam POLARIZED
ELECTRON
ADSORBATE
COVERED
DIFFRACTION
191 FROM
CLEAN AND
Fe(110)
J. K I R S C H N E R lnstitut far Grenzflitchenforschung und Vakuumphysik, Kernforschungsanlage Jiilich, Postfach 1013, D - 5170 Jiilich, Fed. Rep. of Germany Received 16 August 1983; accepted for publication 3 November 1983
Intensity and spin polarization of the (0,0) beam from Fe(ll0) have been measured for the clean surface and for a coverage of up to a quarter of a monolayer of oxygen and sulfur. By the choice of a particular geometry spin-orbit coupling effects are eliminated, so that pure exchange scattering is observed. The energy ranges from - 1 to - 100 eV; polarization of more than 20% is observed at low energies, From the comparison of the results for clean and adsorbate covered surfaces it is concluded, that the adsorption of O and S in small amounts does not generate a "magnetically dead" surface layer.
Surface Science 138 (1984) 203-210 North-Holland. Amsterdam
203
THE ROLE OF RECOIL ATOMS IN ION EXCITED AUGER ELECTRON EMISSION FROM SINGLE CRYSTALS V . U . K I T O V a n d E.S. P A R I L I S Arifov Institute of Electronics, Tashkent, USSR Received 9 May 1983; accepted for publication 23 September 1983 The recent experiment by N. Benazeth seems to prove the theoretical prediction of orientational anisotropy of ion excited Auger electron emission. But in the experiment, the Auger electron