Electron Paramagnetic Resonance of Gamma Irradiation Damage Centres in Acetyl and Carbamyl-β-Methyl Choline Chloride

2003 ◽  
Vol 2003 (1) ◽  
pp. 26-27
Author(s):  
Şemsettin Osmanoğlu ◽  
M. Halim Başkan
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Gamma Irradiation ◽  
Choline Chloride ◽  
Epr Spectra ◽  
Irradiation Damage ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

The EPR spectra of 7-irradiated powders of acetyl-β-methyl choline chloride (AβMCCl) and carbamyl-β-methyl choline chloride (CβMCCl) indicated the existence of the [Me3NĊMeCH2OCOMe]Cl radical in the former and of the [Me3NĊMeCH2OCONH2]Cl radical in the latter.

Electron Paramagnetic Resonance of some Irradiated Ammonium Compounds

1994 ◽  
Vol 49 (12) ◽  
pp. 1159-1164 ◽  
Author(s):  
Fevzi Köksal ◽  
Metin Yavuz
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Gamma Irradiation ◽  
Ultraviolet Irradiation ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Irradiation Damage ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Epr Parameters ◽  
Electron Paramagnetic ◽  
Ammonium Compounds

Abstract Gamma irradiation damage centres in (NH4)2SiF6, (NH4)2SnCl6, (NH4)2PtCl6, [(CH3)2NH2]2SnCl6, (NH4)2PdCl6 and ultraviolet irradiation damage centres in (CH3)4NCH3COO and (CH3)4NBr have been investigated by electron paramagnetic resonance spectroscopy. It has been found that the radicals produced in (NH4)2SiF6 and (NH4)2SnCl6 is N2H4+ , and those in (NH4)2PtCl6 are NH3+ and (PtCl6)3-. In [(CH3)2NH2]2SnCl6 the species is (CH3)2NH+ , and in (NH4)2PdCl6 the species is (PdCl6)3 -. Furthermore, it has been shown that the ultraviolet irradia­ tion produces ĊH3 and CO2- radicals in (CH3)4NCH3COO and ĊH3 radical in (CH3)4NBr. The EPR parameters of the observed radicals have been determined.

Electron Paramagnetic Resonance of Radicals Formed during Milling

1960 ◽  
Vol 33 (2) ◽  
pp. 462-468 ◽  
Author(s):  
S. E. Bresler ◽  
S. N. Zhurkov ◽  
E. N. Kazbekov ◽  
E. M. Saminskiĭ ◽  
E. E. Tomashevskiĭ
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Gamma Rays ◽  
Epr Spectra ◽  
Mechanical Degradation ◽  
Present Communication ◽  
Surface Layers ◽  
Paramagnetic Resonance ◽  
Mechanical Destruction ◽  
Electron Paramagnetic

Abstract It is well known that during the mechanical degradation of polymers there takes place scission of molecular chains and the formation of macroradicals. It is of considerable interest to study the electron paramagnetic resonance (EPR) spectra of the macroradicals produced by milling, and to compare them with the spectra of the macroradicals formed in the process of polymerization, and also during the irradiation of polymers by gamma rays and neutrons. We may endeavor to compare the amount of macroradicals formed with the extent of mechanical destruction (for instance with the area of the new interface which is formed). In addition, as was found by experience, the macroradicals formed by mechanical scission are good models for the investigation of reactivity since practically all of them are in the newly formed surface layers and are therefore very accessible to various chemical influences. They enter easily into reaction with various agents present in the medium since in this process diffusion from the surface is found in practice not to be a predominating factor. In the present communication we give the first EPR results obtained on mechanically degraded polymers.

Characterization of titanium dopants in sodium alanate by electron paramagnetic resonance spectroscopy

2005 ◽  
Vol 20 (12) ◽  
pp. 3265-3269 ◽  
Author(s):  
Meredith T. Kuba ◽  
Sandra S. Eaton ◽  
Christine Morales ◽  
Craig M. Jensen
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Epr Spectra ◽  
Minor Amount ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Dehydrogenation Kinetics ◽  
Electron Paramagnetic ◽  
Kinetics Of

Electron paramagnetic resonance (EPR) spectra were obtained for samples of Ti-doped NaAlH4 subjected to different numbers of cycles of dehydrogenation/re-hydrogenation. Ti is observed to evolve from its initial Ti(III) state through a series of Ti(0) species during the first 5 cycles. Although the conversion of Ti(III) to Ti(0) occurs much more readily for TiCl3-doped samples than those prepared with TiF3, in both cases the evolution of Ti follows the same sequence that involves 3 distinguishable Ti(0) species and ends in the predominance of the same single Ti(0) species. The spectrum of a sample of NaAlH4 containing 2 mol% of cubic Al3Ti is distinctly different than any of those observed for the Ti(0) species that arise during the hydrogen cycling of the hydride. The major changes in the nature of the predominant Ti species have little if any effect on the dehydrogenation kinetics, which strongly suggests that the profoundly enhanced hydrogen cycling kinetics of Ti-doped NaAlH4 are due to a Ti species present in only a relatively minor amount.

Growth and EPR properties of KSm(WO4)2 and KEr(WO4)2 single crystals

Open Physics ◽  
2012 ◽  
Vol 10 (2) ◽  
Author(s):  
Grzegorz Leniec ◽  
Tomasz Skibiński ◽  
Slawomir Kaczmarek ◽  
Przemyslaw Iwanowski ◽  
Marek Berkowski
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Hyperfine Structure ◽  
Single Crystals ◽  
Angular Dependence ◽  
Growth Conditions ◽  
Magnetic Interactions ◽  
Epr Spectra ◽  
Paramagnetic Resonance ◽  
Temperature Dependences ◽  
Electron Paramagnetic

AbstractGrowth conditions and electron paramagnetic resonance investigations of two well oriented KSm(WO4)2 and KEr(WO4)2 single crystals have been presented and discussed. Hyperfine structure of Sm3+ ion was detected and analyzed for angular and temperature dependences. EPR spectra of KEr(WO4)2 and its angular dependence showed the presence of 5 magnetically nonequivalent Er centers in the crystal. A change in the type of magnetic interactions was analyzed using mixed (Gaussian and Lorentzian) fits of the EPR spectra.

Electron paramagnetic resonance (EPR) spectra of Mn++ at normal and defect sites of a crystalline ZnS lattice

1973 ◽  
Vol 16 (10) ◽  
pp. 1375-1379
Author(s):  
A. Ya. Yakunin ◽  
I. V. Shtambur ◽  
A. S. Kushnir ◽  
S. A. Omel'chenko
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Epr Spectra ◽  
Paramagnetic Resonance ◽  
Defect Sites ◽  
Electron Paramagnetic
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