Li 1s core exciton in LiH studied by x-ray Raman scattering spectroscopy

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dc.contributor University of Helsinki, Department of Physics en Paredes-Mellone, O. A. Stutz, G. E. Ceppi, S. A. Arneodo Larochette, P. Huotari, S. Gilmore, K. 2019-01-11T07:45:01Z 2019-01-11T07:45:01Z 2019-02-06
dc.identifier.citation Paredes-Mellone , O A , Stutz , G E , Ceppi , S A , Arneodo Larochette , P , Huotari , S & Gilmore , K 2019 , ' Li 1s core exciton in LiH studied by x-ray Raman scattering spectroscopy ' , Journal of Physics. Condensed Matter , vol. 31 , no. 5 , 055501 . en
dc.identifier.issn 0953-8984
dc.identifier.other PURE: 121050048
dc.identifier.other PURE UUID: 9a3a6e71-6090-4594-a7e5-86c854884d35
dc.identifier.other WOS: 000454109900001
dc.identifier.other Scopus: 85058872600
dc.identifier.other ORCID: /0000-0003-4506-8722/work/52695279
dc.description.abstract The Li 1s core excitation spectra in LiH was studied by means of x-ray Raman scattering (XRS) spectroscopy in a wide range of momentum transfers q. The analysis of the near-edge region of the measured spectra in combination with q-dependent ab initio calculations of XRS spectra based on the Bethe-Salpeter equation (BSE) reveals that the prominent peak at the excitation onset arises from two main contributions, namely a pre-edge peak associated to a p-type core exciton and strong transitions to empty states near the bottom of the conduction band, which is in contrast to previous experimental studies that attributed that feature to a single excitonic peak. The p-like angular symmetry of the core exciton is supported by BSE calculations of the relative contributions to the XRS spectra from monopole and dipole transitions and by the observed decrease of its normalised intensity for increasing momentum transfers. Higher energy spectral features in the measured XRS spectra are well reproduced by BSE, as well as by real-space multiple-scattering calculations. en
dc.format.extent 9
dc.language.iso eng
dc.relation.ispartof Journal of Physics. Condensed Matter
dc.rights en
dc.subject x-ray Raman scattering en
dc.subject core-exciton en
dc.subject lithium hydride en
dc.subject LITHIUM HYDRIDE en
dc.subject METAL-HYDRIDES en
dc.subject EDGE SPECTRA en
dc.subject EXCITATIONS en
dc.subject 114 Physical sciences en
dc.title Li 1s core exciton in LiH studied by x-ray Raman scattering spectroscopy en
dc.type Article
dc.description.version Peer reviewed
dc.type.uri info:eu-repo/semantics/other
dc.type.uri info:eu-repo/semantics/publishedVersion

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