Quand la résonance paramagnétique électronique de l'uranium(IV) est-elle observable?

1980 ◽  
Vol 58 (22) ◽  
pp. 2377-2379 ◽  
Author(s):  
Edgar Soulié ◽  
Gérard Folcher ◽  
Basil Kanellakopulos
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Magnetic Susceptibility ◽  
Ground State ◽  
Excited Level ◽  
Electronic Ground State ◽  
Epr Spectra ◽  
Paramagnetic Resonance ◽  
X Band ◽  
Electron Paramagnetic ◽  
Electronic Ground

For non-Kramers ions, the electronic ground state may be nondegenerate. Then, if the first electronic excited level lies more than 0.3 cm−1 above the ground state, no electron paramagnetic resonance can occur between them in the X band. This is the case whenever a temperature-independent paramagnetism is observed in the magnetic susceptibility of the powder. An example of this situation, conflicting with published epr spectra, is provided by U(cupferron)4.

Influence of the Nature of the Ligands on the Electronic Ground State of Organouranium(V) Compounds, Studied by Electron Paramagnetic Resonance

1997 ◽  
Vol 36 (25) ◽  
pp. 5931-5936 ◽  
Author(s):  
Didier Gourier ◽  
Daniel Caurant ◽  
Jean Claude Berthet ◽  
Christophe Boisson ◽  
Michel Ephritikhine
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Ground State ◽  
Electronic Ground State ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic ◽  
Electronic Ground

Multi-Band Electron Paramagnetic Resonance Study of Microcrystalline and Cluster Silicon Embedded in SiO2

2000 ◽  
Vol 609 ◽  
Author(s):  
Takashi Ehara ◽  
Tadaaki Ikoma ◽  
Shozo Tero-Kubota
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Line Width ◽  
Electron Paramagnetic Resonance Study ◽  
Epr Spectra ◽  
Paramagnetic Resonance ◽  
Band Electron ◽  
X Band ◽  
Epr Signal ◽  
Band Spectra ◽  
Electron Paramagnetic

ABSTRACTDangling bond defects (DB) in silicon microcrystallines and clusters embedded in SiO2 have been studied by X- and Q-band electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra due to the DB were remarkably depending on the grain size, which was controlled by annealing temperature. The microcrystalline containing film shows a broad and unsymmetrical EPR signal at g = 2.006 with the line width of 13 G in X-band spectra. The signal can be simulated by using the anisotropic g-values of Pb center. The Si cluster samples obtained from the annealing at less than 800°C give an asymmetric EPR spectra at about g = 2.004 with the line width of about 9 G in X-band. The EPR signal due to the E' center was also observed.

scholarly journals Magnetic characterization of microcrystalline Na3Ln0.99–xEr0.01Crx(PO4)2 orthophosphates synthesized by Pechini method (Ln = La, Gd)

2018 ◽  
Vol 35 (4) ◽  
pp. 733-745 ◽  
Author(s):  
S.M. Kaczmarek ◽  
G. Leniec ◽  
H. Fuks ◽  
T. Skibiński ◽  
A. Pelczarska ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Pechini Method ◽  
Epr Spectra ◽  
Magnetic Characterization ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic ◽  
Co Doped

Abstract Na3Ln(PO4)2 orthophosphates (Ln = La, Gd) doped with Er3+ and co-doped with Cr3+ ions were synthesized by Pechini method and characterized by electron paramagnetic resonance (EPR) and magnetic susceptibility measurements. Low temperature EPR spectra were detected and analyzed in terms of temperature dependence and the structure of the obtained materials. They show that erbium and chromium ions substitute Ln3+ and also Na+ ions or Na+ channels forming complex EPR spectra. Both kinds of ions reveal ferromagnetic type of interaction which shows some anomaly at the temperature between 10 K and 15 K. Magnetic susceptibility reveals a weak antiferromagnetic kind of interaction dominating in the whole temperature range, from 3.5 to 300 K.

Substituent effects on the triplet–singlet energy separation in diphenylmethylene

1977 ◽  
Vol 55 (12) ◽  
pp. 2286-2291 ◽  
Author(s):  
Robert W. R. Humphreys ◽  
Donald R. Arnold
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Ground State ◽  
Signal Intensity ◽  
Substituent Effects ◽  
Epr Spectra ◽  
Energy Separation ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

The electron paramagnetic resonance (epr) spectra of the diarylmethylenes: diphenylmethylene, p-cyanodiphenylmethylene, p-methoxydiphenylmethylene, p,p′-dimethoxydiphenylmethylene, p,p′-dicyanodiphenylmethylene, p-cyano-p′-methoxydiphenylmethylene, have been studied. The zero-field splitting parameters have been determined. The signal intensity as a function of temperature (ca. 4–20 K) indicates these methylenes are ground state triplet species.

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