TY  - JOUR
A1  - Johansson, Fredrik O. L.
A1  - Leitner, Torsten
A1  - Bidermane, Ieva
A1  - Born, Artur
A1  - Föhlisch, Alexander
A1  - Svensson, Svante
A1  - Mårtensson, Nils
A1  - Lindblad, Andreas
T1  - Auger- and photoelectron coincidences of molecular O2 adsorbed on Ag(111)
JF  - Journal of electron spectroscopy and related phenomena : the international journal on theoretical and experimental aspects of electron spectroscopy
N2  - 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 Ag(3)d/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.
KW  - oxygen/Ag(111)
KW  - Auger electron
KW  - photoelectron
KW  - coincidence
KW  - APECS
KW  - spectroscopy
Y1  - 2022
U6  - https://doi.org/10.1016/j.elspec.2022.147174
SN  - 0368-2048
SN  - 1873-2526
VL  - 256
PB  - Elsevier
CY  - New York, NY [u.a.]
ER  - 
TY  - JOUR
A1  - Born, Artur
A1  - Johansson, Fredrik O. L.
A1  - Leitner, Torsten
A1  - Bidermane, Ieva
A1  - Kuehn, Danilo
A1  - Martensson, Nils
A1  - Föhlisch, Alexander
T1  - The degree of electron itinerancy and shell closing in the core-ionized state of transition metals probed by Auger-photoelectron coincidence spectroscopy
JF  - Physical chemistry, chemical physics : a journal of European Chemical Societies
N2  - Auger-photoelectron coincidence spectroscopy (APECS) has been used to examine the electron correlation and itinerance effects in transition metals Cu, Ni and Co. 
It is shown that the LVV Auger, in coincidence with 2p photoelectrons, spectra can be represented using atomic multiplet positions if the 3d-shell is localized (atomic-like) and with a self-convoluted valence band for band-like (itinerant) materials as explained using the Cini-Sawatzky model. 
For transition metals, the 3d band changes from band-like to localized with increasing atomic number, with the possibility of a mixed behavior. 

Our result shows that the LVV spectra of Cu can be represented by atomic multiplet calculations, those of Co resemble the self-convolution of the valence band and those of Ni are a mixture of both, consistent with the Cini-Sawatzky model.
KW  - spectra
KW  - Ni
Y1  - 2022
U6  - https://doi.org/10.1039/d2cp02477b
SN  - 1463-9076
SN  - 1463-9084
VL  - 24
IS  - 32
SP  - 19218
EP  - 19222
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  -