Formation of color centers in anion-doped crystals

Hirai, Masamitsu

doi:10.1016/0022-3697(90)90146-7

Cited by 9 publications

(4 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is possibly one or both of these that is being destroyed, and the phosphorescence of Cu-doped sodium chloride due to both radiation damage and the doping has been described by others. 26,27 Another possibility is suggested when considering these data in comparison with that from nantokite below. With regard to Figure 4, in the 10 min scan time of the first scan, the XEOL background signal decreases by a factor of 2.8.…”

Section: Resultsmentioning

confidence: 99%

Real Time Observation of X-ray-Induced Surface Modification Using Simultaneous XANES and XEOL-XANES

et al. 2013

View full text Add to dashboard Cite

In experiments preliminary to the design of an X-ray-excited optical luminescence (XEOL)-based chemical mapping tool we have used X-ray micro (4.5 × 5.2 μm) and macro (1 × 6 mm) beams with similar total fluxes to assess the effects of a high flux density beam of X-rays at energies close to an absorption edge on inorganic surfaces in air. The near surface composition of corroded cupreous alloys was analyzed using parallel X-ray and optical photoemission channels to collect X-ray absorption near-edge structure (XANES) data at the Cu K edge. The X-ray fluorescence channel is characteristic of the composition averages over several micrometers into the surface, whereas the optical channel is surface specific to about 200 nm. While the X-ray fluorescence data were mostly insensitive to the X-ray dose, the XEOL-XANES data from the microbeam showed significant dose-dependent changes to the superficial region, including surface cleaning, changes in the oxidation state of the copper, and destruction of surface compounds responsible for pre-edge fluorescence or phosphorescence in the visible. In one case, there was evidence that the lead phase in a bronze had melted. Conversely, data from the macrobeam were stable over several hours. Apart from localized heating effects, the microbeam damage is probably associated with the O3 loading of the surface and increased reaction rate with atmospheric water vapor.

show abstract

Section: Resultsmentioning

confidence: 99%

Real Time Observation of X-ray-Induced Surface Modification Using Simultaneous XANES and XEOL-XANES

et al. 2013

View full text Add to dashboard Cite

show abstract

“…By analogy with the previously studied doped AHCs (see, for example, Refs. [12,28,41]), mobile interstitial halogen atoms, formed during X-irradiation at 80 K, can both interact with each other and become localized in the field of impurity lithium ions (i.e. to form the H A centres).…”

Section: Absorption Spectra Of Radiation Defects In Nacl:limentioning

confidence: 99%

“…Refs. [28][29][30][31][32][33]). Meanwhile, the processes of EE relaxation under continuous external impact (e.g.…”

Section: Introductionmentioning

confidence: 99%

Radiation defects in NaCl matrix with reduced lattice symmetry caused by light cation doping and elastic uniaxial deformation

Shunkeyev¹,

Ubaev²,

Lushchik³

et al. 2021

physics

View full text Add to dashboard Cite

The processes of radiation defect creation and radiative relaxation of electronic excitations under applied local or/and uniaxial elastic deformation have been studied in NaCl crystals by means of optical absorption, luminescence and thermoactivation spectroscopy methods. In NaCl:Li at 80 K, X-ray-induced absorption bands peaked around 3.35 and 4.6 eV have been detected and ascribed to interstitial halide atoms located nearby Li impurity cations, HA(Li) centres. Subsequent thermal annealing of HA(Li) centres leads to the formation of polyhalide centres responsible for the absorption band at 5.35 eV. In an X-irradiated and stressed NaCl:Li crystal (degree of uniaxial elastic deformation of ε = 0.9%), the peak of thermally stimulated luminescence at ~115 K is composed of the ~2.7-eV emission appearing, in our opinion, due to the recombination of the electron, thermally released from an F′ centre, with a hole-type HA(Li) centre. The applied uniaxial elastic stress facilitates the self-trapping of anion excitons in regular regions of a NaCl lattice and impedes the energy transfer by mobile excitons to impurities/defects and, in turn, attenuates the Br-related luminescence peaked at 3.95 eV with respect to the π-emission of self-trapped excitons (~3.35 eV). The 3.95 eV emission has been detected in a natural NaCl crystal containing homologous Br impurity ions.

show abstract

“…Furthermore, these effects strongly depend on the impurity type, including their charge state, concentration, distribution, etc. [35,36].…”

Section: Influence Of Impurity Ions On the Efficiency Of Defect Creationmentioning

confidence: 99%

Influence of complex impurity centres on radiation damage in wide-gap metal oxides

Lushchik

Попов

et al. 2016

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

Formation of color centers in anion-doped crystals

Cited by 9 publications

References 54 publications

Real Time Observation of X-ray-Induced Surface Modification Using Simultaneous XANES and XEOL-XANES

Real Time Observation of X-ray-Induced Surface Modification Using Simultaneous XANES and XEOL-XANES

Radiation defects in NaCl matrix with reduced lattice symmetry caused by light cation doping and elastic uniaxial deformation

Influence of complex impurity centres on radiation damage in wide-gap metal oxides

Contact Info

Product

Resources

About