K-shell double core-hole spectroscopy in molecules
2013 (English)In: The European Physical Journal Special Topics, ISSN 1951-6355, Vol. 222, no 9, 2035-2055 p.Article, review/survey (Refereed) Published
A great deal of attention has been devoted in the last few years to photoionization processes in isolated molecules leading to the formation of double core-hole (DCH) states. There are two main experimental avenues to induce such processes, namely single-photon absorption followed by the simultaneous ejection of two core electrons, and x-ray-induced multiphoton processes leading to the production of DCH states via the sequential absorption of two soft x- ray photons on a time scale on the order of the molecular Auger lifetime (4-8 femtoseconds for light elements). The formation of molecular two-site (ts) DCH states, in particular, shows great potential as a powerful tool for chemical analysis. A compelling motivation for the study of ts-DCH states is their ability to probe the local chemical environment more sensitively than either single core-hole (SCH) or single-site (ss) DCH states. The enhanced sensitivity originates from the fact that the double ionization potential (DIP) of ts-DCH states is directly coupled to induced changes in the valence charge distribution at the two different atomic sites. Here a review of the recent literature is presented on both types of experiments, and on the related theoretical work.
Place, publisher, year, edition, pages
2013. Vol. 222, no 9, 2035-2055 p.
IdentifiersURN: urn:nbn:se:uu:diva-210936DOI: 10.1140/epjst/e2013-01985-9ISI: 000325715600003OAI: oai:DiVA.org:uu-210936DiVA: diva2:665101