scholarly journals Study of an F center in molten KCl

1983 ◽  
Author(s):  
M. Parrinello ◽  
A. Rahman
Keyword(s):  
F Center

On the theory of transitions of F center electrons

Physica ◽  
1954 ◽  
Vol 3 (7-12) ◽  
pp. 1016-1020
Author(s):  
H MEYER
Keyword(s):  
F Center

DICHROIC EFFECTS IN THE F-CENTER LUMINESCENCE IN KBr

1976 ◽  
Vol 37 (C7) ◽  
pp. C7-154-C7-157
Author(s):  
G. BALDACCHINI ◽  
U. M. GRASSANO ◽  
A. TANGA
Keyword(s):  
F Center

Recent Developments in the Asymmetric Detrifluoroacetylative Reactions of in situ Generated Mono-Fluorinated Enolates

2020 ◽  
Vol 24 (18) ◽  
pp. 2181-2191
Author(s):  
Li Wang ◽  
Ziyi Li ◽  
Jiang Liu ◽  
Jianlin Han ◽  
Hiroki Moriwaki ◽  
...  
Keyword(s):  
Organic Chemistry ◽  
Bond Cleavage ◽  
Synthetic Methodology ◽  
Research Topics ◽  
Synthetic Organic Chemistry ◽  
Nucleophilic Reactions ◽  
F Center ◽  
Recent Developments

The development of an efficient and mild synthetic methodology for the construction of bioactive fluorine-containing molecules represents one of the hot research topics in general synthetic organic chemistry. In this review, some recent progresses achieved in the development of detrifluoroacetylatively generated mono-fluorinated enolates via CC bond cleavage and their asymmetric nucleophilic reactions for assembly of chiral quaternary C-F center containing compounds.

F-CENTER IMPACT ON PHOTOELECTROCHEMICAL PROPERTIES IN HEMATITE

2010 ◽  
Vol 24 (18) ◽  
pp. 1963-1970 ◽  
Author(s):  
ARVIDS STASHANS ◽  
RICHARD RIVERA
Keyword(s):  
Experimental Data ◽  
Optical Properties ◽  
Oxygen Vacancy ◽  
Quantum Chemical ◽  
Vacancy Defect ◽  
Chemical Model ◽  
Photoelectrochemical Properties ◽  
Structural And Optical Properties ◽  
F Center ◽  
Quantum Chemical Model

Structural and optical properties of F-center (two electrons trapped by an oxygen vacancy) defect in hematite have been studied using a quantum-chemical model. Calculated absorption energies, 0.9 eV and 3.6 eV, are discussed in terms of the available experimental data. An explanation for the origin of experimentally observed electron depletion in hematite is proposed.

Growth of F Center in Zone II as a Function of Electron Injection in Some Potassium Halide Crystals

1981 ◽  
Vol 128 (9) ◽  
pp. 1995-1999 ◽  
Author(s):  
A. K. Maiti ◽  
K. Goswami ◽  
S. Choudhuri ◽  
A. Choudhury
Keyword(s):  
Electron Injection ◽  
F Center ◽  
Zone Ii ◽  
Potassium Halide

Advanced Evaluation Methods of Residual Stress in Bioceramics Wear Surfaces

2010 ◽  
Vol 64 ◽  
pp. 43-48
Author(s):  
Giuseppe Pezzotti
Keyword(s):  
Residual Stress ◽  
Surface Stress ◽  
Electron Probe ◽  
Stress Fields ◽  
Fluorescence Probes ◽  
Surface Residual Stress ◽  
Hip Joints ◽  
Polycrystalline Alumina ◽  
Probe Size ◽  
F Center

Photo- and electro-stimulated probes have been employed for quantitatively evaluating highly graded residual stress fields generated at the surface of alumina hip joints. Optical calibrations revealed large differences in probe size, which strongly affected the detected magnitude of residual stress. A comparison between the responses of Raman and fluorescence probes in polycrystalline alumina showed that the depth of those probes spread to an extent in the order of the tens of microns even with using a confocal probe configuration. On the other hand, the electro-stimulated luminescence emitted by oxygen vacancy sites (F+ center) in the alumina lattice represented a suitable choice for confining to a shallow volume the stress probe. The electron probe enabled confining the measurement depth to the order of the tens of nanometers. Maps of surface residual stress were collected on both main-wear and non-wear zones of an alumina femoral head. A comparison among stress maps taken at exactly the same location, but employing different probes, clarified the averaging probe effects on surface stress magnitude.

The spin-lattice relaxation and spin-orbit interaction of F center in the relaxed excited state

1983 ◽  
Vol 72 (1-4) ◽  
pp. 171-175 ◽  
Author(s):  
H. Ohkura ◽  
K. Iwahana ◽  
K. Tara ◽  
M. Hirata ◽  
Y. Mori
Keyword(s):  
Excited State ◽  
Lattice Relaxation ◽  
Orbit Interaction ◽  
Spin Lattice Relaxation ◽  
Spin Orbit ◽  
Spin Orbit Interaction ◽  
Spin Lattice ◽  
F Center

scholarly journals Synthesis and Research of Alumina Ceramics Properties

2020 ◽  
Vol 8 (1) ◽  
pp. 20218102
Author(s):  
Evgeniy I. Frolov ◽  
Polina V. Notina ◽  
Sergey V. Zvonarev ◽  
Evgeniya A. Il'ina ◽  
Vyacheslav Yu. Churkin
Keyword(s):  
Optical Properties ◽  
Sol Gel ◽  
Aluminum Nitrate ◽  
Alumina Powder ◽  
Alumina Ceramics ◽  
Powder Synthesis ◽  
Gel Method ◽  
Varying Parameters ◽  
Luminescence Efficiency ◽  
F Center

The article describes in detail alumina powder synthesis by different methods at varying parameters. The technique of obtaining ceramics and the research of the optical properties for determining the materials with the maximum luminescence efficiency is presented. The concentration of the luminescence intrinsic centers and various defects differ for ceramics synthesized by different methods. It is determined that ceramics based on the powder synthesized by a sol-gel method has the maximum thermoluminescence intensity in the F-center peak, whereas for the peak of 360 °C it is obtained with the powder prepared by precipitation of aluminum nitrate with a PEG‑20000 stabilizer.

Spin polarization in the relaxed excited state of the F center in case of saturated optical pumping

1978 ◽  
Vol 27 (10) ◽  
pp. 1009-1011 ◽  
Author(s):  
K. Imanaka ◽  
T. Wada ◽  
T. Iida ◽  
H. Ohkura
Keyword(s):  
Excited State ◽  
Spin Polarization ◽  
Optical Pumping ◽  
F Center
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