J. Phys. IV France
Volume 09, Numéro PR6, June 1999
International Conference on Coincidence Spectroscopy
Page(s) Pr6-137 - Pr6-143
International Conference on Coincidence Spectroscopy

J. Phys. IV France 09 (1999) Pr6-137-Pr6-143

DOI: 10.1051/jp4:1999631

Oxygen adsorption on W(001) studied by low energy (e,2e) spectroscopy

S. Samarin1, J. Berakdar1, R. Herrmann1, H. Schwabe1, O. Artamonov2 and J. Kirschner1

1  Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany
2  Research lnstitute of Physics, St. Petersburg University, Uljanovskaja 1, Petrodvoretz, St. Petersburg 198904, Russia

We applied the low energy (e,2e) spectroscopy in reflection-mode scattering geometry for studying ordered oxygen adsorption on W(001). Primary electrons with the energy of 36 eV were used to excite the correlated electron pairs from a p(2x1) adsorbed oxygen layer. The (e,2e) spectra of clean and oxygen covered W(001) surface were analyzed. It was found that the adsorption of 1 ML of oxygen on W(001) leads to the appearance of an additional structure in the energy distribution of correlated pairs. This structure corresponds to the excitation of electrons from the energy level located at 6.7 ± 0.5 eV below the Fermi level. This result is consistent with the UPS study of the oxygen adsorption on W(001) [1] where the adsorbate photoemission peak was obsewed at 6.5 eV below Fermi level. A theoretical analysis of the emission process is developed and used to explain the main structures in the observed electron pair spectra.

© EDP Sciences 1999