Determination of color centers in CaF2 crystals by multiple gamma-ray irradiations

Chen, Wei; Song, Pingxin; Dong, Yongjun; Zhang, Yingjiu; Wei, Hua

doi:10.1007/s11434-012-5615-z

Cited by 9 publications

(3 citation statements)

References 12 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, when rare earth metals are added, it becomes an effective radiation detector. Using highenergy radiation like X-rays, gamma rays, or ion beams can cause defects and colour centres to form in the CaF 2 crystals [1]. Under ion irradiation, the balance between sputtering-induced surface roughening and diffusion-induced smoothing determines the behaviour of solid surfaces.…”

Section: Introductionmentioning

confidence: 99%

Fractal characterizations of MeV ion fractured CaF2 thin films

Pandey

Yadav

Kumar

et al. 2022

Preprint

View full text Add to dashboard Cite

We present the morphological evolution and fractal characterization of CaF2 thin film surfaces modified by bombardment with 100 MeV Au+8 ions at various fluences. Atomic force microscopy (AFM) combined with line profile and two-dimensional power spectral density (2D-PSD) analysis was utilized to investigate the evolution of surface morphology as a function of fluence. The AFM images were utilized to investigate the relationship between fractal dimension, roughness exponent, lateral correlation length, and ion fluence. The surface erosion owing to sputtering was depicted using Rutherford backscattering spectrometry (RBS). The structural characteristics’ dependency on fluence was explored with the help of glancing angle X-ray diffraction (GAXRD) measurements on virgin and irradiated samples. Tensile stress calculated using peak shift in the glancing angle X-ray diffractogram showed an increase in tensile stress with fluence that caused the surface to crack after the fracture strength of the surface was crossed. 2D-PSD analysis signified the role of sputtering over surface diffusion for the observed surface modifications. Fractal dimensions first increased and then decreased with ion fluence. Lateral correlation length decreased while roughness exponent increased with fluence after the threshold value.

show abstract

Section: Introductionmentioning

confidence: 99%

Fractal characterizations of MeV ion fractured CaF2 thin films

Pandey

Yadav

Kumar

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…From the processing point of view, another significant property of CaF 2 connected to its crystal lattice is the presence of local defects and the related formation of color centers due to irradiation by energetic particles, 13,14 which can manifest either at shape IBF correction or at surface finalization by optical coating, when it is often necessary to use an assistance ion source 15 (see Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

Minimization of CaF2 spherical surface deformation caused by annealing

et al. 2021

View full text Add to dashboard Cite

“…The Ca particle can be detected by the appearance of a broad absorption band centered at ~560 nm. Color center and colloid formation have been observed for irradiation with electrons, ions of energy in the keV to GeV range, Au 4 and C n ( n = 5, 10, 60) cluster ions of MeV energies, neutrons, X‐rays, γ‐rays and UV light . Alternatively, colloids can be generated by additive coloration where samples are quenched after thermal treatments in a metallic gaseous atmosphere .…”

Section: Introductionmentioning

confidence: 99%

Irradiation effects in CaF₂ probed by Raman scattering

Alencar

Ruiz‐Fuertes

Schwartz

et al. 2016

J Raman Spectroscopy

View full text Add to dashboard Cite

The formation conditions and dynamics of Ca colloids and point defects that appear in irradiated single crystals of CaF2 were investigated by Raman spectroscopy. The intensity changes in the Raman spectra because of the presence of different concentrations of point defects and Ca colloids that emerged in CaF2 after irradiation with 2.2 GeV Au ions were used to study their distribution and stability under illumination with three laser wavelengths (473, 532 and 633 nm) at different output powers (2 to 200 mW). A damage saturation at a fluence of 6 × 1011 ion cm−2 was observed. The dependence of the spectral changes on the ion fluence can be described by a core/halo damage cross‐section model. A radius of 13–18 nm was obtained for the outer (halo) cylinder, in agreement with previous swelling studies. Illuminations of irradiated samples with blue (473 nm) and green (532 nm) lasers were found to be extremely efficient in bleaching the samples, while illumination with a red (633 nm) laser did not lead to a sample recovery. This indicates that the bleaching process is governed by recombination of point defects that have to overcome an energy barrier. Typical time constants for the processes involved are presented. Copyright © 2016 John Wiley & Sons, Ltd.

show abstract

Determination of color centers in CaF2 crystals by multiple gamma-ray irradiations

Cited by 9 publications

References 12 publications

Fractal characterizations of MeV ion fractured CaF2 thin films

Fractal characterizations of MeV ion fractured CaF2 thin films

Minimization of CaF2 spherical surface deformation caused by annealing

Irradiation effects in CaF₂ probed by Raman scattering

Contact Info

Product

Resources

About

Determination of color centers in CaF2 crystals by multiple gamma-ray irradiations

Cited by 9 publications

References 12 publications

Fractal characterizations of MeV ion fractured CaF2 thin films

Fractal characterizations of MeV ion fractured CaF2 thin films

Minimization of CaF2 spherical surface deformation caused by annealing

Irradiation effects in CaF2 probed by Raman scattering

Contact Info

Product

Resources

About

Irradiation effects in CaF₂ probed by Raman scattering