NQR and NMR studies on the electron-spin correlation time in paramagnetic insulators

1994 ◽  
Vol 50 (9) ◽  
pp. 6169-6173 ◽  
Author(s):  
Keizo Horiuchi ◽  
Tetsuo Asaji ◽  
Ryuichi Ikeda
Keyword(s):  
Electron Spin ◽  
Correlation Time ◽  
Spin Correlation ◽  
Nmr Studies

The Influence of the Type of Dipping Composition on the Structure of Aramid Cord Threads

2018 ◽  
Vol 45 (4) ◽  
pp. 171-173
Author(s):  
L.N. Andreikova ◽  
S.P. Bobrov ◽  
Yu.O. Andriasyan ◽  
S.G. Karpova ◽  
I.A. Mikhailov
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Correlation Time ◽  
Physicomechanical Properties ◽  
Electron Spin Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Service Properties ◽  
Radical Concentration ◽  
Spin Resonance ◽  
Different Types

Publications concerned with the influence of the type of dipping composition on the adhesion, physicomechanical, and service properties of aramid cord threads of grades Arom-75 (Rusar-75), Arom-175 (Rusar-175), and Rusar-200 are analysed. According to current ideas, the type of dipping composition affects not only the adhesion and physicomechanical properties of aramid cord but also its structure. Using electron spin resonance spectroscopy, we studied specimens of dipped Arom-75 cord threads and undipped threads (for comparison). The parameters characterising the structural state of the investigated polymer specimens were determined: the correlation time, the radical concentration in the investigated specimen, and the ratio of the proportion of dense amorphous regions to the proportion of loose amorphous regions. Data for cord based on Ruslan® threads dipped in two different compositions and data for undipped cord were compared. The possibility of changing the structure of cord and the service properties of mechanical rubber goods with an aramid skeleton by using different types of dipping composition was shown.

scholarly journals Optically Pumped NMR Studies of Electron Spin Polarization and Dynamics: New Constraints on the Composite Fermion Description ofν=1/2

1999 ◽  
Vol 83 (24) ◽  
pp. 5074-5077 ◽  
Author(s):  
A. E. Dementyev ◽  
N. N. Kuzma ◽  
P. Khandelwal ◽  
S. E. Barrett ◽  
L. N. Pfeiffer ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Electron Spin ◽  
Electron Spin Polarization ◽  
Composite Fermion ◽  
Optically Pumped ◽  
Nmr Studies ◽  
Optically Pumped Nmr

Dielektrische Relaxation und Elektronenspinrelaxation von Eisen(III)acetylacetonat in verdünnter Lösung/ Dielectric Relaxation and Electron Spin Relaxation of Ferric Acetylacetonate in Dilute Solutions

1976 ◽  
Vol 31 (5) ◽  
pp. 457-462
Author(s):  
W. Dietz ◽  
H. Kilp ◽  
W. Noerpel ◽  
M. Straßmann ◽  
M. Stockhausen
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Correlation Time ◽  
Wave Length ◽  
Dilute Solutions ◽  
Electron Spin Relaxation ◽  
Electron Spin Resonance Linewidth ◽  
Spin Resonance ◽  
Solvent Molecules ◽  
Permittivity Measurements

Abstract The dielectric loss and electron spin resonance linewidth of ferric acetylacetonate have been measured in dilute solutions of benzene, m-and p-xylene, mesitylene and carbon tetrachloride. Permittivity measurements were made at 10 frequencies in the microwave region (1.2 m to 1 mm wave-length), ESR measurement at 2 frequencies (X and Q band). The permittivity results show a broad non-Debye pattern, yielding a mean correlation time of about 4 ps. The ESR results yield a mean correlation time of about 3 ps. The parallelism between the results obtained by both methods is discussed in view of a common relaxation process, which is the transient deformation of the chelate system resulting from stochastic induction by neighbouring solvent molecules.

2H and 195 Pt NMR Studies of Molecular and Electron Spin Dynamics in Paramagnetic [Cu(H2O)6][PtCl 6]

1998 ◽  
Vol 53 (6-7) ◽  
pp. 447-452
Author(s):  
Takahiro Iijima ◽  
Kengo Orii ◽  
Motohiro Mizuno ◽  
Masahiko Suhara
Keyword(s):  
Activation Energy ◽  
Electron Spin ◽  
Nmr Spectra ◽  
Chemical Shift Anisotropy ◽  
Spin Lattice Relaxation ◽  
Water Molecules ◽  
Temperature Phase ◽  
Nmr Studies ◽  
Teller Distortion ◽  
Exponential Factor

Abstract The temperature dependences of 2H and 195Pt NMR spectra and the spin-lattice relaxation time T1 were measured for [Cu(H2O)6][PtCl6]. From the simulation of 2H NMR spectra, the jump rate of 180° flips of the water molecules (k), the nuclear quadrupole interaction parameters (e2Qq/h, ƞ) and the electron-nucleon dipolar interaction parameter (vD) were obtained. By measuring 2H T1, k was estimated in the temperature range where the spectrum is insensitive to the motion of the water molecules. Above the phase transition temperature, the pre-exponential factor k0 = 8 x1011 s-1 and the activation energy Ea = 15 kJmol-1 for 180° flips of the water molecules were obtained from the spectral simulation and T1. 195Pt NMR spectra showed an axially symmetric and unsymmetric powder pattern of the chemical shift anisotropy at the high and low temperature phase, respectively. For the deuterated compound, the correlation times of the electron spin in Cu2+ were estimated from 195Pt T1 and the activation energy for jumping between the different configurations of Jahn-Teller distortion Δ = 200 K was obtained.

Direct determination of rotational correlation time by electron‐spin echoes

1980 ◽  
Vol 73 (7) ◽  
pp. 3502-3503 ◽  
Author(s):  
Arthur E. Stillman ◽  
Leslie J. Schwartz ◽  
Jack H. Freed
Keyword(s):  
Electron Spin ◽  
Correlation Time ◽  
Direct Determination ◽  
Rotational Correlation Time ◽  
Spin Echoes ◽  
Rotational Correlation

Solid state high resolution nmr studies of electron spin densities in charge-transfer complex-based organic ferromagnets

1999 ◽  
Vol 103 (1-3) ◽  
pp. 2333-2334 ◽  
Author(s):  
Goro Maruta ◽  
Sadamu Takeda ◽  
Kizashi Yamaguchi ◽  
Kazumasa Ueda ◽  
Toyonari Sugimoto
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
High Resolution ◽  
Electron Spin ◽  
Charge Transfer Complex ◽  
Nmr Studies ◽  
High Resolution Nmr ◽  
Organic Ferromagnets ◽  
Spin Densities

Long-Range Structural Information in NMR Studies of Paramagnetic Molecules from Electron Spin−Nuclear Spin Cross-Correlated Relaxation

1999 ◽  
Vol 121 (33) ◽  
pp. 7700-7701 ◽  
Author(s):  
Jérôme Boisbouvier ◽  
Pierre Gans ◽  
Martin Blackledge ◽  
Bernhard Brutscher ◽  
Dominique Marion
Keyword(s):  
Long Range ◽  
Electron Spin ◽  
Nuclear Spin ◽  
Structural Information ◽  
Nmr Studies ◽  
Paramagnetic Molecules
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