Abstract
We have studied double photoionization from molecular inner-shell orbitals and investigated the properties of the resultant double core-hole states in molecules, by multi-electron coincidence spectroscopy with a magnetic bottle electron spectrometer. A brief summary of our previous studies is presented.
Highlights
Single photon double ionization from valence shell orbitals has been extensively studied as a probe of electron correlation
Two possibilities arise in molecules: either the two electrons are ejected from the same K shell of a given atom in the molecule (1-site Double Core Holes (DCH) or K-2) or they originate from two different K-shells, that is from two different atoms in the molecule (2-site DCH or K-1K-1)
Double photoionization from molecular inner-shell orbitals has been recently studied with multi-electron coincidence experiments and synchrotron sources
Summary
Single photon double ionization from valence shell orbitals has been extensively studied as a probe of electron correlation. The coincidence technique is, on the opposite, perfectly well suited to study single photon double ionization with synchrotron radiation It allows for instance the observation of the decay of each DCH state by the successive emission of two Auger electrons, giving access to the intermediate and final states. Single photon double core ionization being a very weak process, its detection had to await the development of a very efficient experimental technique: multi-electron coincidence spectroscopy using a magnetic bottle spectrometer. Such a spectrometer is based on the original design of Kruit and Read [10] and was first implemented to study multiple ionization by J. As will be explained below, it is the coincidence detection of at least 3 of the released electrons that has enabled one to isolate these weak double core ionization processes from the dominant single core ionization ones
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