Sign and Orientation Determination of the Principal Axis of the Electric Field Gradient in Fe57 Enriched Deoxygenated Myoglobin Single Crystals

1974 ◽  
Vol 29 (3-4) ◽  
pp. 241-244 ◽  
Author(s):  
Ulrich Gonser ◽  
Yutaka Maeda ◽  
Alfred Trautwein ◽  
Fritz Parak ◽  
Helmut Formanek
Keyword(s):  
Electric Field ◽  
Electric Field Gradient ◽  
Single Crystals ◽  
Field Gradient ◽  
Principal Axis ◽  
Quadrupole Split ◽  
Mössbauer Measurements ◽  
Orientation Determination ◽  
Two Alternatives

Single crystals of myoglobin enriched on Fe57 with a diameter of about 0.5 mm were prepared. After deoxygenation crystallographic alignment and Mössbauer measurements were carried out at 77°K. In the experiment eight different orientations were selected by rotating the crystal around the b axis, thus, b axis and γ-ray propagation direction remained perpendicular to each other. From the intensity ratio of the quadrupole split spectra we derive the sign and the orientation of the principal axis of the electric field gradient. We find Vzz to be positive and forming an angle of 40° to the b axis. From two alternatives consistent with our experiments we conclude that VZZ is most likely oriented along one of the four Fe-N directions in the heme.

Electric Field Gradient at Gd in Gadolinium and Rare Earth Trifluoride Single Crystals

1984 ◽  
pp. 355-363
Author(s):  
M. Budzynski ◽  
E. A. Goremychkin ◽  
O. I. Kochetov ◽  
A. Latuszynski ◽  
P. Mikolajczak ◽  
...  
Keyword(s):  
Rare Earth ◽  
Electric Field ◽  
Electric Field Gradient ◽  
Single Crystals ◽  
Field Gradient

Measurements of Quadrupole Interactions by Nuclear Orientation and Quadrupole-Interaction-Resolved NMR on Oriented Nuclei

1986 ◽  
Vol 41 (1-2) ◽  
pp. 95-98 ◽  
Author(s):  
K.-H. Ebeling ◽  
R. Eder ◽  
E. Hagn ◽  
E. Zech ◽  
M. Deicher
Keyword(s):  
Electric Field ◽  
Single Crystal ◽  
Electric Field Gradient ◽  
Single Crystals ◽  
Quadrupole Interaction ◽  
Nuclear Orientation ◽  
Hyperfine Fields ◽  
Host Matrix ◽  
Quadrupole Interactions

The techniques of quadrupole-interaction nuclear-orientation and quadrupole-interaction-resolvedNMR on oriented nuclei were applied to radioactive 111In (T1/2 = 2.8 d), 198Au(T1/2= 2.7 d) and 199Au (T1/2 = 3.1 d), mass-separator-implanted into single crystals of hep Coand hep Gd. For 111InGd the quadrupole interaction was observed via the broadening of theresonance and the dependence of the effective quadrupole interaction on the angle θbetween thec-axis of the single crystal and the direction of magnetization. For 198AuGd the large electric fieldgradient known from the literature could not be confirmed. For 198AuCo and 199AuCo thequadrupole substructure has been resolved, and the electric field gradient of Au in hep Co was determined to be -0.84(4) x 1017V/cm2. The magnetic hyperfine fields of Au in hep and fee Codiffer by about 20%. These experiments have shown that hep Co may be a good host matrix forthe determination of the quadrupole interaction of heavy radioactive nuclei with resonanceprecision.

Determination of electric field gradient parameters in tellurium

1976 ◽  
Vol 54 (16) ◽  
pp. 1692-1698 ◽  
Author(s):  
K. Hamilton ◽  
B. M. Powell ◽  
P. Martel
Keyword(s):  
Electric Field ◽  
Electric Field Gradient ◽  
Field Gradient ◽  
Inelastic Neutron Scattering ◽  
Mean Square Displacement ◽  
Inelastic Neutron ◽  
Charge Model ◽  
Bond Charge ◽  
Bond Charge Model

The relative intensities of the Mössbauer doublet in Te have been analysed at 4 K and 80 K by utilizing values of the mean square displacement tensor derived from inelastic neutron scattering measurements. The orientation β of the electric field gradient ellipsoid and its asymmetry parameter η have been determined. At 4 K, β = 90°, η = −0.17 and at 80 K, β = 92°, η = −0.48. A simple 'bond charge' model is proposed in an attempt to understand the discrepancy between these values of the electric field gradient parameters and those obtained theoretically by other authors.

The electric field gradient in natural iron-doped chrysoberyl Al2BeO4 and sinhalite MgAlBO4 single crystals

2011 ◽  
Vol 38 (10) ◽  
pp. 787-799 ◽  
Author(s):  
Werner Lottermoser ◽  
Günther J. Redhammer ◽  
Sven-Ulf Weber ◽  
Fred Jochen Litterst ◽  
Gerold Tippelt ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Field Gradient ◽  
Single Crystals ◽  
Field Gradient ◽  
Natural Iron ◽  
Iron Doped
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