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

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

13C NMR-spektroskopische Untersuchungen an Äthylaluminiumverbindungen / 13C NMR Spectroscopic Investigations of Ethylaluminium Compounds

1976 ◽  
Vol 31 (6) ◽  
pp. 730-736 ◽  
Author(s):  
R. Rottler ◽  
C. G. Kreiter ◽  
G. Fink
Keyword(s):  
Temperature Dependence ◽  
Exchange Reaction ◽  
13C Nmr ◽  
Line Shape ◽  
Nmr Spectra ◽  
Exchange Process ◽  
Kcal Mole ◽  
Line Shapes ◽  
Calculated Line ◽  
C Nmr

The 13C NMR spectra of the ethylaluminium compounds [Al(C2H5)xCl3_x]2 x = 1, 1,5, 2 and 3 are presented and factors governing the temperature dependence of the line shape are discussed. The exchange reaction of terminal ethyl groups for chlorine ligands and ethyl ligands, resp., in ethylaluminium-sesquichloride was investigated by fitting the calculated line shapes to the observed spectra.The energy of activation of this exchange process was determined as to be 12,3 ‡ 1,5 kcal/mole. The synthesis of 13C2-[Al(C2H5)Cl2]2 is described.

Temperature dependence of ESR spectra of spin-labelled met-hemoglobin

1976 ◽  
Vol 4 (3) ◽  
pp. 281-285 ◽  
Author(s):  
Vesna Nöthig-Laslo ◽  
J.N. Herak ◽  
S. Maričić
Keyword(s):  
Temperature Dependence ◽  
Esr Spectra

ON THE TEMPERATURE DEPENDENCE OF PARAMAGNETIC RESONANCE IN THE CASE OF THE ISING MODEL

1961 ◽  
Vol 39 (12) ◽  
pp. 1733-1737 ◽  
Author(s):  
Y. Y. Lee
Keyword(s):  
Ising Model ◽  
Temperature Dependence ◽  
Approximation Method ◽  
Line Shape ◽  
Theoretical Study ◽  
Shape Function ◽  
Paramagnetic Resonance ◽  
One Dimensional ◽  
The One ◽  
Line Shape Function

The adequacy of the approximation method used by McMillan and Opechowski in their theoretical study of the temperature dependence of the paramagnetic resonance line shape function is very difficult to ascertain for the case of a typical paramagnetic crystal. For this reason the approximation method has been investigated for the very simple case of the one-dimensional Ising model. Exact expressions for the line shape function of the model are compared with expressions obtained by the approximation method mentioned above. The agreement between the two expressions is found to be very good in general, and extremely good at very low temperatures.

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

Competitive inclusion of chloro-substituted acetic acids into β-cyclodextrin monitored by rotational correlation frequencies of 4-hydroxy-2,2,6,6-tetramethylpiperidinyl-1-oxy radical

1982 ◽  
Vol 60 (15) ◽  
pp. 1959-1961 ◽  
Author(s):  
Yoshiaki Motozato ◽  
Tsukasa Nishihara ◽  
Chuichi Hirayama ◽  
Yoshiaki Furuya ◽  
Yoshio Kosugi
Keyword(s):  
Acetic Acid ◽  
Structural Change ◽  
Temperature Dependence ◽  
Trichloroacetic Acid ◽  
Esr Spectroscopy ◽  
Esr Spectra ◽  
Nmr Studies ◽  
Acetic Acids ◽  
Rotational Correlation

Competitive inclusion in β-cyclodextrin between 4-hydroxy-2,2,6,6-tetramethylpiperidinyl-1-oxy and chloro-substituted acetic acids has been monitored by esr spectroscopy. The temperature dependence of the rotational correlation frequencies calculated by Kivelson's equation, using esr spectra of the radical, suggests that a structural change of β-cyclodextrin occurs at about 30 °C and that trichloroacetic acid is included extensively at 20–35 °C, but significant inclusion of acetic acid is not observed. The degree of competitive inclusion is in the order of trichloro, dichloro, and monochloroacetic acids over the range of 20–80 °C. Carbon-13 nmr studies also prove the inclusion of trichloroacetic acid showing an inclusion shift of the trichloromethyl carbon by 1.4 ppm.

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