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December 7, 1990

X-ray Photoelectron, Auger Electron and Ion Fragment Spectra of O2 and Potential Curves of O22+

mats @Uppsala University, Mats Göthe, phdthesis

X-ray photoelectron, Auger electron and ion fragment spectra of O2 and potential curves of O22+.
M. Larsson, P. Baltzer, S. Svensson, B. Wannberg, N. Mårtensson, A. Naves de Brito, N. Correia, M. P. Keane, M. Carlsson Göthe and L. Karlsson.

Abstract: The O22+ ion has been studied by means of electron-impact-induced and photon-induced Auger electron spectroscopy and oxygen ion fragment spectroscopy of O2. The oxygen ion kinetic energy spectrum was recorded by inverting the relevant potentials of an electron spectrometer for the detection of positive particles. The 4Σ– and 2Σ– Ols initial core hole states have been studied using monochromatized X-ray photoelectron spectroscopy. Potential energy curves for a number of electronic states of the O22+ dication have been calculated with the complete active space SCF (CASSCF) and multi-reference contracted CI (MRCCD methods with a l-particle basis set of medium size ([8s, 6p,2d]). An analysis of the O2 Auger electron spectrum based on the computed potential curves of O22+ it presented. The autoionisation satellites are analyzed and it is found that these lines correspond to molecular singly ionized final states. One line at 510.7 eV, however, is associated with an atomic-like transition. Two shake-up Auger satellites are identified by a comparison with a recent O1s shake-up spectrum from O2.

Read the publication here.

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