Spectral Property and Stability of Color Centers in Alkali Halide Crystals Induced by He + Ion Implantation at Room Temperature

1993 ◽  
Vol 10 (3) ◽  
pp. 163-166 ◽  
Author(s):  
Hongen Gu ◽  
Zhifang Chen ◽  
Zhijuan Li
Keyword(s):  
Ion Implantation ◽  
Spectral Property ◽  
Alkali Halide ◽  
Room Temperature ◽  
Color Centers ◽  
Alkali Halide Crystals

Optical Absorption Spectra of KBr:Pb2+ Crystals

1973 ◽  
Vol 51 (21) ◽  
pp. 2242-2248 ◽  
Author(s):  
Robert E. Chaney ◽  
P. W. M. Jacobs ◽  
Taiju Tsuboi
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Alkali Halide ◽  
Room Temperature ◽  
Nonlinear Least Squares ◽  
Energy Separation ◽  
Optical Absorption Spectra ◽  
Absorption Bands ◽  
Fundamental Properties ◽  
Alkali Halide Crystals

The fundamental properties of the absorption spectra of KBr:Pb2+ crystals have been studied at various temperatures from the liquid helium range to room temperature. The observed absorption bands are assigned to the so-called A, B, C, and D' bands by analogy with the absorption bands of other s2-configuration ions in alkali halide crystals. The B, C, and D′ bands overlap but have been resolved into their components by nonlinear least squares analysis. A discussion is given of the energy separation between the B and C bands in Sn2+-, Tl+-, and Pb2+-doped alkali halide crystals.

Electron Microscopy of Precipitates of NaCl: FeCl2 Crystals

1977 ◽  
Vol 35 ◽  
pp. 258-259
Author(s):  
M. Jose Yacaman ◽  
R. W. Vook
Keyword(s):  
Electron Microscopy ◽  
Atomic Absorption Spectroscopy ◽  
Alkali Halide ◽  
Impurity Concentration ◽  
Room Temperature ◽  
Volume Fraction ◽  
Nucleation Density ◽  
Controlled Atmosphere ◽  
Alkali Halide Crystals ◽  
Kyropoulos Method

Suzuki phase precipitates1 produced by divalent impurities in alkali halide crystals can act as preferential gucleation sites for vapor deposited metals using the gold decoration method2. The present work applies this technique to the study of NaCl: FeCl2. Crystals with several FeCl2 concentrations were grown by the Kyropoulos method in a controlled atmosphere and thermally homogenized. The final impurity concentration Cs was determined by atomic absorption spectroscopy. Precipitates were inducel bg linear cooling from 550°C to room temperature at rates of 7.64, 3.82, and 23°C/hr. Gold decoration was performed at 10 Torr on vacuum-cleaved surfaces at 100°C. Precipitates were visible because of an enhanced nucleation density: Figs. la - c. The volume fraction Vσ of precipitates was determined from the total fractional area of the precipitates in micrographs taken from several areas of the replicas. Vσ is linearly related to Cs (Fig. 2) with a slope of 8.1 ± 1.0.

Role of F3 color centers in colloid formation process in alkali-halide crystals

1999 ◽  
Vol 42 (11) ◽  
pp. 931-934
Author(s):  
L. I. Shchepina ◽  
V. N. Solomatov ◽  
T. G. Yur'eva
Keyword(s):  
Formation Process ◽  
Alkali Halide ◽  
Color Centers ◽  
Alkali Halide Crystals ◽  
Colloid Formation

Effect of Plastic Flow upon Color Centers in Alkali Halide Crystals

1954 ◽  
Vol 94 (5) ◽  
pp. 1390-1390 ◽  
Author(s):  
Masayasu Ueta ◽  
Werner Känzig
Keyword(s):  
Plastic Flow ◽  
Alkali Halide ◽  
Color Centers ◽  
Alkali Halide Crystals
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