dc.contributor.author
Vincenti, M. A.
dc.contributor.author
Montereali, R. M.
dc.contributor.author
Bonfigli, F.
dc.contributor.author
Nichelatti, E.
dc.contributor.author
Nigro, V.
dc.contributor.author
Piccinini, M.
dc.contributor.author
Koenig, M.
dc.contributor.author
Mabey, P.
dc.contributor.author
Rigon, G.
dc.contributor.author
Dabrowski, H. J.
dc.date.accessioned
2024-04-12T12:08:13Z
dc.date.available
2024-04-12T12:08:13Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/43212
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-42928
dc.description.abstract
Nominally-pure lithium fluoride (LiF) crystals were irradiated with monochromatic hard x-rays of energy 5, 7, 9 and 12 keV at the METROLOGIE beamline of the SOLEIL synchrotron facility, in order to understand the role of the selected x-ray energy on their visible photoluminescence (PL) response, which is used for high spatial resolution 2D x-ray imaging detectors characterized by a wide dynamic range. At the energies of 7 and 12 keV the irradiations were performed at five different doses corresponding to five uniformly irradiated areas, while at 5 and 9 keV only two irradiations at two different doses were carried out. The doses were planned in a range between 4 and 1.4 × 103 Gy (10.5 mJ cm−3 to 3.7 J cm−3), depending on the x-ray energy. After irradiation at the energies of 7 and 12 keV, the spectrally-integrated visible PL intensity of the F2 and F3+ colour centres (CCs) generated in the LiF crystals, carefully measured by fluorescence microscopy under blue excitation, exhibits a linear dependence on the irradiation dose in the investigated dose range. This linear behaviour was confirmed by the optical absorption spectra of the irradiated spots, which shows a similar linear behaviour for both the F2 and F3+ CCs, as derived from their overlapping absorption band at around 450 nm. At the highest x-ray energy, the average concentrations of the radiation-induced F, F2 and F3+ CCs were also estimated. The volume distributions of F2 defects in the crystals irradiated with 5 and 9 keV x-rays were reconstructed in 3D by measuring their PL signal using a confocal laser scanning microscope operating in fluorescence mode. On-going investigations are focusing on the results obtained through this z-scanning technique to explore the potential impact of absorption effects at the excitation laser wavelength.
en
dc.format.extent
6 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
lithium fluoride
en
dc.subject
colour centres
en
dc.subject
photoluminescence
en
dc.subject
monochromatic hard x-rays
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::530 Physik::530 Physik
dc.title
Advanced spectroscopic investigation of colour centres in LiF crystals irradiated with monochromatic hard x-rays
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
205701
dcterms.bibliographicCitation.doi
10.1088/1361-648X/ad2796
dcterms.bibliographicCitation.journaltitle
Journal of Physics: Condensed Matter
dcterms.bibliographicCitation.number
20
dcterms.bibliographicCitation.volume
36
dcterms.bibliographicCitation.url
https://doi.org/10.1088/1361-648X/ad2796
refubium.affiliation
Physik
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
1361-648X
refubium.resourceType.provider
WoS-Alert