The sub-bandgap energy loss satellites in the RIXS spectra of beryllium compounds / Kuusik I.,Kaeaembre T.,Kooser K.,Pustovarov V.,Ivanov V.,Kukk E.,Kikas A. // JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - 2011. - V. 184, l. 7. - P. 366-370.

ISSN/EISSN:

0368-2048 / нет данных

Type:

Article

Abstract:

Resonant X-ray inelastic scattering spectra have been measured in BeO, phenakite (Be(2)SiO(4)) and chrysoberyl (BeAl(2)O(4)) with the excitation energy near the beryllium K edge. The RIXS spectra excited in the vicinity of the Be is core resonance show two principal features: the scattering on a valence excitation (which at higher excitation energies verges into the characteristic K emission), and a remarkably strong energy loss sideband to the elastic scattering peak. The energy loss shoulder appears to result from lattice relaxation in the absorption site. The comparison of the RIXS spectra of phenakite, chrysoberyl and BeO shows that the strength of the low energy sideband differs greatly; it is strongest in BeO and weakest in phenakite. The Si 2p RIXS spectra of phenakite also display a similar strong sub-bandgap energy loss tail. To gain further insight to this process, transitions in a system with a single vibrational mode have been modelled. The phonon relaxation has been simulated empirically by ``smearing{''} the photoabsortion-populated vibrational levels with lower levels. This simple model is able to qualitatively explain this wide energy loss shoulder. (C) 2011 Elsevier B.V. All rights reserved.

Author keywords:

RIXS; Core exciton; Hot luminescence PHENAKITE BE2SIO4; CRYSTAL-CHEMISTRY; CORE EXCITONS; BEO; SCATTERING; LEVEL

DOI:

10.1016/j.elspec.2011.02.002

Web of Science ID:

ISI:000293314800003

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUL
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	PHENAKITE BE2SIO4; CRYSTAL-CHEMISTRY; CORE EXCITONS; BEO; SCATTERING; LEVEL
Research-Areas	Spectroscopy
Web-of-Science-Categories	Spectroscopy
Author-Email	ivar@fi.tartu.ee
ResearcherID-Numbers	Kaambre, Tanel/K-3980-2014 Kikas, Arvo/H-3136-2015
ORCID-Numbers	Kaambre, Tanel/0000-0003-1453-4663
Funding-Acknowledgement	Estonian Science Foundation {[}7615, 8216]; NordForsk; European Community; European Social Fund, Estonia {[}1.2.0401.09-0079]
Funding-Text	This work was supported by the Estonian Science Foundation (grants nos. 7615 and 8216), NordForsk and the European Community - Research Infrastructure Action under the FP6 ``Structuring the European Research Area{''} Programme (through the Integrated Infrastructure Initiative ``Integrating Activity on Synchrotron and Free Electron Laser Science{''}). This work has been partially supported by graduate school ``Functional materials and processes{''} receiving funding from the European Social Fund under project 1.2.0401.09-0079 in Estonia. The authors also wish to thank MAX-lab staff for the support during the measurements.
Number-of-Cited-References	22
Usage-Count-Since-2013	6
Journal-ISO	J. Electron Spectrosc. Relat. Phenom.
Doc-Delivery-Number	799VS