scholarly journals Combined EPR and Photoluminescence Study of Electron and Proton Irradiated 3C-SiC

2019 ◽  
Vol 963 ◽  
pp. 301-304
Author(s):  
Abdul Al Atem ◽  
Victor Bratus ◽  
Bruno Canut ◽  
Jeremie Lefevre ◽  
Gérard Guillot ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Electron Paramagnetic Resonance ◽  
Point Defects ◽  
Epr Spectroscopy ◽  
Proton Irradiation ◽  
Paramagnetic Resonance ◽  
Photoluminescence Study ◽  
Infra Red ◽  
Cubic Silicon Carbide ◽  
Electron Paramagnetic

Combined Photoluminescence (PL) and electron paramagnetic resonance (EPR) spectroscopy have been used to characterize cubic silicon carbide (3C-SiC) samples after electron and proton irradiation. We have studied the effects of the thermal annealing (500-1000°C) on the PL intensity in the visible and the near infra-red (NIR) ranges and identified the point defects formation after these two processes of irradiation.

Point Defects in SiC

2008 ◽  
Vol 1069 ◽  
Author(s):  
Ádám Gali ◽  
Michel Bockstedte ◽  
Ngyen Tien Son ◽  
Erik Janzén
Keyword(s):  
Silicon Carbide ◽  
Electron Paramagnetic Resonance ◽  
Ab Initio ◽  
Point Defects ◽  
Semiconductor Technology ◽  
Tight Control ◽  
Accurate Calculation ◽  
Paramagnetic Resonance ◽  
Absorption And Emission ◽  
Electron Paramagnetic

ABSTRACTTight control of defects is pivotal for semiconductor technology. However, even the basic defects are not entirely understood in silicon carbide. In the recent years significant advances have been reached in identification of defects by combining the experimental tools like electron paramagnetic resonance and photoluminescence with ab initio calculations. We summarize these results and their consequences in silicon carbide based technology. We show recent methodological developments making possible the accurate calculation of absorption and emission signals of defects.

Investigation of Antioxidant Activity of Pomegranate Juices by Means of Electron Paramagnetic Resonance and UV-Vis Spectroscopy

2015 ◽  
Vol 98 (4) ◽  
pp. 866-870 ◽  
Author(s):  
Violetta Kozik ◽  
Krystyna Jarzembek ◽  
Agnieszka Jędrzejowska ◽  
Andrzej Bąk ◽  
Justyna Polak ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Free Radical ◽  
Epr Spectroscopy ◽  
Antioxidant Properties ◽  
Free Radical Scavenger ◽  
Pomegranate Juice ◽  
Radical Scavenger ◽  
Paramagnetic Resonance ◽  
Vis Spectroscopy ◽  
Electron Paramagnetic

Abstract Pomegranate fruit (Punica granatum L.) is a source of numerous phenolic compounds, and it contains flavonoids such as anthocyanins, anthocyanidins, cyanidins, catechins and other complexes of flavonoids, ellagitannins, and hydrolyzed tannins. Pomegranate juice shows antioxidant, antiproliferative, and anti-atherosclerotic properties. The antioxidant capacity (TEAC) of the pomegranate juices was measured using electron paramagnetic resonance (EPR) spectroscopy and 1,1-diphenyl-2-picrylhydrazyl (DPPH•) as a source of free radicals, and the total phenolic (TP) content was measured using UV-Vis spectroscopy. All the examined pomegranate juices exhibited relatively high antioxidant properties. The TEAC values determined by means of EPR spectroscopy using Trolox (TE) as a free radical scavenger were in the range of 463.12 to 1911.91 μmol TE/100 mL juice. The TP content measured by the Folin-Ciocalteu method, using gallic acid (GA) as a free radical scavenger, widely varied in the investigated pomegranate juice samples and ranged from 1673.62 to 5263.87 mg GA/1 L juice. The strongest antioxidant properties were observed with the fresh pomegranate juices obtained from the fruits originating from Israel, Lebanon, and Azerbaijan. Correlation analysis of numerical data obtained by means of EPR spectroscopy (TEAC) and UV-Vis spectroscopy (TP) gave correlation coefficient (r) = 0.90 and determination coefficient (r2) = 0.81 (P <0.05).

Interaction of Point Defects with Impurities in the Si-SiO2 System and its Influence on the Properties of the Interface

2009 ◽  
Vol 156-158 ◽  
pp. 145-148 ◽  
Author(s):  
Daniel Kropman ◽  
E. Mellikov ◽  
K. Lott ◽  
Tiit Kärner ◽  
Ivo Heinmaa ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Magnetic Resonance ◽  
Fermi Level ◽  
Point Defects ◽  
Interface Properties ◽  
Hydrogen Ions ◽  
Paramagnetic Resonance ◽  
Proposed Model ◽  
P Type ◽  
Electron Paramagnetic

The results of investigation of the point defect generation and interaction with impurities in the Si-SiO2 system during the process of its formation by means of electron paramagnetic resonance (EPR) and nucleous magnetic resonance (NMR) technique are presented. It has been shown that the diference in point defects interaction with hydrogen at the Si-SO2 interface with n- and p-type conductivity are connected with the sign of hydrogen ions incorporation dependence on the Fermi level position in accordance with the proposed model. The interface properties may be improved by laser irradiation.

scholarly journals Chain initiation

2019 ◽  
Vol 89 (2) ◽  
pp. 179-186
Author(s):  
V. V. Ptushenko
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Epr Spectroscopy ◽  
Paramagnetic Resonance ◽  
Chain Initiation ◽  
Radio Spectroscopy ◽  
Scientific Instrumentation ◽  
History Of ◽  
Scientists And Engineers ◽  
Electron Paramagnetic

This article describes the formation of the chemical electron paramagnetic resonance (EPR) spectroscopy institute established by Academician Vladislav V. Voevodsky (1917–1967) along with the history of the development of the instrumentation basis for this field of science in the Union of Soviet Socialist Republics (USSR). The design of the first EPR spectrometers for the chemical radio spectroscopy initiated the emergence of a new scientific instrumentation field in this country. Based on recollections shared by scientists and engineers and an examination of archive materials, the author reconstructs relevant events and identifies major participants in this process.

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