Dynamical Effects in Triplet ESR Spectra of Solid Solutions. II. Correlation of the Rate of Intermolecular Triplet Excitation Transfer with the Line Shape of the ESR Spectrum of a Solution of Aromatic Phosphorescent Hydrocarbons in a Rigid Matrix

1967 ◽  
Vol 47 (2) ◽  
pp. 509-519 ◽  
Author(s):  
Philémon Kottis
Keyword(s):  
Solid Solutions ◽  
Line Shape ◽  
Esr Spectra ◽  
Excitation Transfer ◽  
Triplet Excitation ◽  
Esr Spectrum ◽  
Rigid Matrix

ESR Spectra o f Normal Human Serum after Treatment with Complement Activating Agents*

1980 ◽  
Vol 35 (9-10) ◽  
pp. 844-847
Author(s):  
Melchiorre Brai ◽  
Antonio Bartolotta ◽  
Maria Brai ◽  
Marcello Messina ◽  
Pietro L. Indovina
Keyword(s):  
Free Radical ◽  
Human Serum ◽  
Complement Activation ◽  
Esr Spectra ◽  
Normal Human Serum ◽  
Rabbit Serum ◽  
Esr Spectrum ◽  
Normal Human ◽  
Radical Signal

Abstract We describe the appearance of a free-radical signal in the ESR spectrum of normal human serum incubated with several complement activating agents. The intensity of this signal is dependent of dose of activating agents, time and temperature. Signals elicited by different complement activators differ in morphology and kinetics. Inhibition by treatment with EDTA and the presence of the signal in activated C 6-deficient rabbit serum suggest that the con-vertase forming steps of complement activation (C2 to 5) could be the source of free-radical containing molecules.

TEMPERATURE DEPENDENCES OF Y2Cu2O5 ESR SPECTRA

1989 ◽  
Vol 03 (05) ◽  
pp. 427-435 ◽  
Author(s):  
A.A. GIPPIUS ◽  
V.V. MOSHCHALKOV ◽  
YU. A. KOKSHAROV ◽  
A.N. TIKHONOV ◽  
B.V. MILL ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Single Crystal ◽  
Room Temperature ◽  
Esr Spectra ◽  
Single Line ◽  
Néel Temperature ◽  
Esr Spectrum ◽  
Complicated Form ◽  
Temperature Dependences ◽  
G Factors

Temperature dependences of the ESR spectrum in Y 2 Cu 2 O 5 compound are studied for both polycrystalline and single crystal samples. The g-factors along the main axes are found to be ga=2.099, gb=2.048, and gc=2.21 at room temperature, T=293 K . As temperature decreases, the linewidth ΔH increases in agreement with the Huber’s formula ΔH=A(T N /(T−T N ))β+B(θ/T+1) with the following parameters: A=1513±10 Oe , B=509±10 Oe , T N =7±1 K , θ=18±2 K , β=1.3±0.3. In the vicinity of the Neel Temperature, T N , the ESR spectrum has a very complicated form indicating the existence of clusters with different internal magnetic fields. Below T N , a single line symmetrical ESR spectrum is recovered.

Choice of line shape representation and reliability of line parameters for single line esr spectra

1970 ◽  
Vol 22 (1) ◽  
pp. 251-258 ◽  
Author(s):  
T. de Neef ◽  
D. C. Koningsberger ◽  
P. van der Leeden
Keyword(s):  
Line Shape ◽  
Shape Representation ◽  
Esr Spectra ◽  
Single Line

Additions and Corrections - Nonvertical Triplet Excitation Transfer to cis- and trans-Stilbene

1984 ◽  
Vol 106 (21) ◽  
pp. 6459-6459
Author(s):  
Jack Saltiel ◽  
Gary Marchand ◽  
Ewa Kirkor-Kaminska ◽  
William Smothers ◽  
Warren Mueller ◽  
...  
Keyword(s):  
Excitation Transfer ◽  
Triplet Excitation ◽  
Trans Stilbene ◽  
Cis And Trans

Die Stärke der antiferromagnetischen Kopplung in Gallium-dotiertem α-Cr2O3 / The Intensity of the Antiferromagnetic Coupling in Gallium-doped, α-Cr2O3

1976 ◽  
Vol 31 (6) ◽  
pp. 622-629
Author(s):  
K. Dräger
Keyword(s):  
Temperature Dependence ◽  
Line Shape ◽  
Cluster Model ◽  
Esr Spectra ◽  
Antiferromagnetic Coupling ◽  
Mixed System ◽  
Exchange Constant ◽  
Coupling Energy ◽  
Nearest Neighbours ◽  
System 1

ESR-spectra of the mixed system (1-x) Cr2O3 • x Ga2O3 having a concentration depending Neeltemperature TN are thoroughly investigated. For polycristalline samples with concentrations up to 6% it is shown that the line shape of the absorption curves has Lorentzian character in the whole temperature range. Within a mean variation of 0,8% and for T>TN, the temperature dependence of the ESR-intensity confirmes the proposed cluster-model. While pure Cr2O3 has a coupling energy of ΔE = 430 cm-1, this value reduces slowly by the incorporation of Ga3+-ions. At a concentration of x = 6% the reduction amounts to about 9%. As all spins exhibit a uniform behaviour, one evidently can calculate the exchange constant J12 for nearest neighbours interaction even in the Gallium-doped crystal

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