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Naslov:Photoexcitation processes in atoms
Avtorji:ID Kodre, Alojz, Uni-Lj (Avtor)
ID Arčon, Iztok, UNG (Avtor)
ID Padežnik Gomilšek, Jana, Uni-MB (Avtor)
Datoteke: Gradivo nima datotek, ki so prostodostopne za javnost. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.16 - Samostojni znanstveni sestavek ali poglavje v monografski publikaciji
Organizacija:UNG - Univerza v Novi Gorici
Opis:Photoelectric absorption is characterized by a smooth power-law decrease of the cross section with photon energy. Absorption edges reveal rich structure, which continues into the high-energy side. The quasiperiodic signal, superposed onto the smooth basis, due to scattering of the photoelectron on the neighbours of the target atom provides the basis for the structural (XAFS) analysis of the material. Irregular tiny resonances and edges that appear over the same general range as XAFS are recognized as intra-atomic effects: multielectron excitations (MEE) owing to correlated motion in the electronic cloud. The systematic study of MEE began on noble gases and metallic vapours, both of which are gases of free atoms. With some extremely strong MEE, mostly coexcitations of the subvalence d and f electrons, the structural XAFS analysis may be compromised; hence, there is a need to independently determine the MEE signal, the atomic absorption background (AAB) for the analyzed element, and remove it prior to analysis. In view of the scarcity of elements which can practically be prepared in a free-atom gas state, several approaches to approximate the AAB have been developed: analysis of disordered compounds, where the weak and simple XAFS signal can be modelled and removed, and correlation analysis of the absorption spectra of several independent samples, where the AAB is extracted in an iterative procedure.
Ključne besede:photoexcitation, XAFS, multielectron excitations, atomic absorption background
Leto izida:2021
Št. strani:5
Številčenje:1, 1
PID:20.500.12556/RUNG-7083 Novo okno
COBISS.SI-ID:89611267 Novo okno
DOI:https://doi.org/10.1107/S1574870720003511 Novo okno
NUK URN:URN:SI:UNG:REP:BDYIG1GF
Datum objave v RUNG:15.12.2021
Število ogledov:2883
Število prenosov:0
Metapodatki:XML DC-XML DC-RDF
:
KODRE, Alojz, ARČON, Iztok in PADEŽNIK GOMILŠEK, Jana, 2021, Photoexcitation processes in atoms. V : International tables for crystallography [na spletu]. Bognor Regis. Vol. 1, no. 1. [Dostopano 28 april 2025]. Pridobljeno s: https://repozitorij.ung.si/IzpisGradiva.php?lang=slv&id=7083
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Gradivo je del monografije

Naslov:International tables for crystallography : X-ray absorption spectroscopy and related techniques
Uredniki:C. T. Chantler
Kraj izida:Bognor Regis
Založnik:Wiley
Leto izida:2020
ISBN:978-1-119-43394-1
COBISS.SI-ID:89610755 Novo okno
Naslov zbirke:International tables for crystallography
ISSN zbirke:1574-8707

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