Münster 1999 – wissenschaftliches Programm
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O: Oberflächenphysik
O 11: Poster (I)
O 11.4: Poster
Montag, 22. März 1999, 19:30–22:30, Aula
APPLICATION OF LOW ENERGY (e,2e) SPECTROSCOPY FOR STUDYING OXYGEN ADSORPTION ON W(001) — •S. Samarin1, J. Berakdar1, H. Schwabe1, O. Artamonov2, and J. Kirschner1 — 1MAX-Planck-Institut f"ur Mikrostrukturphysik, Weinberg 2, D-06120 Halle/S. — 2Research Institute of Physics, St.Petersburg University, Uljanovskaja 1, Petrodvoretz, 198904 St. Petersburg, 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 observed at 6.5 eV below Fermi level. Taking into account
the electron-pairs diffraction from the oxygen superlattice we
explain the main structure in the electron energy sharing
distribution.
[1] A.M. Bradshaw, D. Menzel, and M. Steinkilberg. Japan. J. Appl. Phys. Suppl.2, Pt.2 (1974), 841-846.