Johansson, F.O.L.; Leitner, T.; Bidermane, I.; Born, A.; Foehlisch, A.; Svensson, S.; Martensson, N.; Lindblad, A.: Auger-and photoelectron coincidences of molecular O2 adsorbed on Ag (111). Journal of Electron Spectroscopy and Related Phenomena 256 (2022), p. 147174/1-6
10.1016/j.elspec.2022.147174
Open Accesn Version
Abstract:
The oxygen on Ag(111) system has been investigated with Auger electron–photoelectron coincidence spectroscopy (APECS). The coincidence spectra between O 1s core level photoelectrons and O KLL Auger electrons have been studied together with Ag3d/AgM4,5NN coincidences. We also describe the electron–electron coincidence spectrometer setup, CoESCA, consisting of two angle resolved time-of-flight spectrometers at a synchrotron light source. Contributions from molecular oxygen and chemisorbed oxygen are assigned using the coincidence data, conclusions are drawn primarily from the O 1s/O KLL data. The data acquisition and treatment procedure are also outlined. The chemisorbed oxygen species observed are relevant for the catalytic ethylene oxidation.