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Double Core Excitations in Lithium Halides
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Mjukröntgenfysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Mjukröntgenfysik.
2007 (Engelska)Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, nr 4, s. 045112-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Resonant inelastic x-ray scattering spectra of LiF , LiCl , LiBr , and LiI excited in the vicinity of the Li double core hole resonances are presented. All lithium halides show similar phenomenology, including scattering via states where both excited electrons are localized during the scattering process, as well as states where one electron delocalizes. Also transitions that involve additional band excitations are observed. A strong influence of the chemical surrounding is found, and it is discussed in terms of the ionic character of the chemical bond.

Ort, förlag, år, upplaga, sidor
2007. Vol. 75, nr 4, s. 045112-
Nyckelord [en]
X-ray scattering, Electron density of states and band structure of crystalline solids, Solid alkali halides
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:uu:diva-94521DOI: 10.1103/PhysRevB.75.045112ISI: 000243895600029OAI: oai:DiVA.org:uu-94521DiVA, id: diva2:168394
Tillgänglig från: 2006-05-05 Skapad: 2006-05-05 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
Ingår i avhandling
1. Double Excitations in Helium Atoms and Lithium Compounds
Öppna denna publikation i ny flik eller fönster >>Double Excitations in Helium Atoms and Lithium Compounds
2006 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis addresses the investigation of doubly excited 2l´nl states in helium atoms and double core excitations in solid lithium compounds.

Measurements on He are made in field free environments and under the influence of electric and magnetic fields, using synchrotron based inelastic photon scattering. Cross sections for scattering to singly excited final states are directly determined and compared to theoretical results and are found to be in excellent agreement. Radiative and spin-orbit effects are quantified and are shown to play an important role in the overall characterization of highly excited He states below the N =2 threshold. A dramatic electric field dependence is also observed in the flourecence yield already for relatively weak fields. This signal increase, induced by electric as well as magnetic fields, is interpreted in terms of mixing with states of higher fluorescence branching ratios.

Double core excitations at the lithium site in solid lithium compounds are investigated using resonant inelastic x-ray scattering (RIXS). The lithium halides LiF, LiCl, LiBr and LiI are studied as well as the molecular compounds Li2O, Li2CO3 and LiBF4. States with one, as well as both, of the excited electrons localized at the site of the bare lithium nucleus are identified, and transitions which involve additional band excitations are observed. A strong influence of the chemical surrounding is found, and it is discussed in terms of the ionic character of the chemical bond.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2006. s. 114
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 186
Nyckelord
Atomic and molecular physics, Soft X-ray emission, resonant inelastic X-ray scattering, double excitations, lithium halide, helium, Atom- och molekylfysik
Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:uu:diva-6889 (URN)91-554-6572-2 (ISBN)
Disputation
2006-05-26, Polhelmsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15
Opponent
Handledare
Tillgänglig från: 2006-05-05 Skapad: 2006-05-05 Senast uppdaterad: 2016-04-21Bibliografiskt granskad

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