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

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.

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

Luminescence and ESR studies of relationships between O−-centres and structural iron in natural and synthetically hydrated kaolinites

Clay Minerals ◽  
1989 ◽  
Vol 24 (4) ◽  
pp. 671-693 ◽  
Author(s):  
Lelia M. Coyne ◽  
Patricia M. Costanzo ◽  
B. K. G. Theng
Keyword(s):  
Line Shape ◽  
Spectroscopic Properties ◽  
Esr Spectra ◽  
Stored Energy ◽  
Tetrahedral Sheet ◽  
Degree Of Hydration ◽  
Long Term Stability ◽  
Structural Iron ◽  
Degree Of Order

AbstractLuminescence, induced by dehydration and by wetting with hydrazine and unsymmetrically substituted hydrazine, and related ESR spectra have been observed from several kaolinites, synthetically hydrated kaolinites, and metahalloysites. The amine-wetting luminescence results suggest that intercalation, not a chemiluminescence reaction, is the luminescence trigger. Correlation between dehydration-induced luminescence and g = 2 ESR signals associated with O−-centres in several natural halloysites, and concurrent diminution of the intensity of both these signal types as a function of aging in two 8.4 Å synthetically hydrated kaolinites, confirm a previously-reported relationship between the luminescence induced by dehydration and in the presence of O−-centres (holes, i.e., electron vacancies) in the tetrahedral sheet. Furthermore, the ESR spectra of the 8.4 Å hydrate showed a concurrent change in the line shape of the g = 4 signal from a shape usually associated with structural Fe in an ordered kaolinite, to a simpler one typically observed in more disordered kaolinite, halloysite, and montmorillonite. Either structural Fe centres and the O−-centres interact, or both are subject to factors previously associated with degree of order. The results question the long-term stability of the 8.4 Å hydrate, although XRD does not indicate interlayer collapse over this period. Complex inter-relationships are shown between intercalation, stored energy, structural Fe, and the degree of hydration which may be reflected in catalytic as well as spectroscopic properties of the clays.

Synthesis of novel TEMPO stable free (poly)radical derivatives and their host–guest interaction with cucurbit[6]uril

2016 ◽  
Vol 40 (1) ◽  
pp. 503-511 ◽  
Author(s):  
Gabriela Ionita ◽  
Augustin M. Madalan ◽  
Ana Maria Ariciu ◽  
Andrei Medvedovici ◽  
Petre Ionita
Keyword(s):  
Shape Analysis ◽  
Line Shape ◽  
Esr Spectra ◽  
Line Shape Analysis

The line shape analysis of the ESR spectra of TEMPO derivatives in the absence and in the presence of cucurbit[6]uril provides information on host–guest complexes.

Spectroscopie par Source Laser. III. Intensités et Largeurs des Raies de la Transition 00°1–10°0 du Protoxyde d'Azote. Ecarts à la Forme de Lorentz

1973 ◽  
Vol 51 (3) ◽  
pp. 302-310 ◽  
Author(s):  
Nelly Lacome ◽  
Christian Boulet ◽  
Eric Arié
Keyword(s):  
Line Shape ◽  
Atmospheric Pressure ◽  
Spectroscopic Method ◽  
Single Mode ◽  
The Other ◽  
Single Line ◽  
Mode Laser ◽  
Single Mode Laser ◽  
Lorentz Line ◽  
Semi Empirical

Intensities and half-widths of self-broadened N2O have been measured in the 00°1–10°0 band by a spectroscopic method using a stabilized, single line, single mode laser source.On the other hand, line overlap has permitted us to point out a deviation from Lorentz line shape for pressures greater than atmospheric pressure. An attempt to interpret this difference by a semi-empirical formalism is proposed, proceeding from "super Lorentz" line shape recently introduced by Varanasi.

scholarly journals Size and temperature dependence of the line shape of ESR spectra of the XXZ antiferromagnetic chain

2017 ◽  
Vol 95 (2) ◽  
Author(s):  
Hiroki Ikeuchi ◽  
Hans De Raedt ◽  
Sylvain Bertaina ◽  
Seiji Miyashita
Keyword(s):  
Temperature Dependence ◽  
Line Shape ◽  
Esr Spectra

Tandem scanning reflected light microscopy: How it works and applications

1986 ◽  
Vol 44 ◽  
pp. 84-87
Author(s):  
Alan Boyde ◽  
Milan Hadravský ◽  
Mojmír Petran ◽  
Timothy F. Watson ◽  
Sheila J. Jones ◽  
...  
Keyword(s):  
Light Microscopy ◽  
Focal Plane ◽  
Central Symmetry ◽  
Single Line ◽  
Scanning Microscope ◽  
Reflected Light ◽  
Illuminating Light ◽  
Illuminating Beam

The principles of tandem scanning reflected light microscopy and the design of recent instruments are fully described elsewhere and here only briefly. The illuminating light is intercepted by a rotating aperture disc which lies in the intermediate focal plane of a standard LM objective. This device provides an array of separate scanning beams which light up corresponding patches in the plane of focus more intensely than out of focus layers. Reflected light from these patches is imaged on to a matching array of apertures on the opposite side of the same aperture disc and which are scanning in the focal plane of the eyepiece. An arrangement of mirrors converts the central symmetry of the disc into congruency, so that the array of apertures which chop the illuminating beam is identical with the array on the observation side. Thus both illumination and “detection” are scanned in tandem, giving rise to the name Tandem Scanning Microscope (TSM). The apertures are arranged on Archimedean spirals: each opposed pair scans a single line in the image.

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