Quadrupole coupling constant of12B in ZrB2 single crystal

1978 ◽  
Vol 4 (1-2) ◽  
pp. 224-225 ◽  
Author(s):  
T. Minamisono ◽  
S. Kogo ◽  
K. Okajima ◽  
K. Sugimoto
Keyword(s):  
Single Crystal ◽  
Quadrupole Coupling Constant ◽  
Coupling Constant ◽  
Quadrupole Coupling

scholarly journals Electric Quadrupole Interaction of 20F in a KZnF3 Single Crystal

1976 ◽  
Vol 31 (11) ◽  
pp. 1298-1302 ◽  
Author(s):  
H. Ackermann ◽  
D. Dubbers ◽  
M. Grupp ◽  
P. Heitjans ◽  
H.-J. Stöckmann ◽  
...  
Keyword(s):  
Single Crystal ◽  
Room Temperature ◽  
Electric Quadrupole ◽  
Quadrupole Coupling Constant ◽  
Electric Quadrupole Interaction ◽  
Coupling Constant ◽  
Nmr Spectrum ◽  
Quadrupole Coupling ◽  
Γ Ray ◽  
Anisotropy Measurement

Abstract Nuclear magnetic resonance measurements were carried out on neutron activated 20F(T1/2=11s) nuclei in a single crystal of KZnF3. The quadrupolar splitted NMR spectrum, detected via the 20F β-radiation asymmetry, could be observed using a radio frequency modulation technique. The quadrupole coupling constant was determined to e2 q Q/h= + (12.0 ± 1.5) MHz at room temperature. The sign of e2 q Q was obtained from a simultaneous γ-ray anisotropy measurement on the succeeding 20Ne transition. Utilising a calculated field gradient of the fluorine atom, an fQ = 4.6% is determined. This value is compared with literature data of similar compounds.

AN INVESTIGATION OF THE NUCLEAR RESONANCE ABSORPTION SPECTRUM OF Al27 IN A SINGLE CRYSTAL OF EUCLASE

1955 ◽  
Vol 33 (6) ◽  
pp. 286-297 ◽  
Author(s):  
R. G. Eades
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
Field Gradient ◽  
Resonance Spectrum ◽  
Quadrupole Coupling Constant ◽  
Coupling Constant ◽  
Theoretical Dependence ◽  
Absolute Value ◽  
Principal Axes ◽  
Quadrupole Coupling

The nuclear magnetic resonance spectrum of Al27 in a single crystal of HBeAlSiO5 (euclase) in an external magnetic field of 7000 gauss is described. The Al27 nuclei are found to occupy two kinds of lattice sites which differ from each other only in the orientation of the principal axes of the electric field gradient tensors whose eigenvalues are all distinct, but identical at both sites. The absolute value of the quadrupole coupling constant for both groups of Al27 nuclei is found to be 5173 ± 10 kc./sec. and the axial asymmetry parameter of the field gradient tensors at both the lattice positions is 0.698 ± 0.009. The two sets of principal axes are reflections of each other in the (010) plane which is consistent with the symmetry of the proposed crystal structure. The theoretical dependence of the spectrum line frequencies on the applied magnetic field is given for one group of Al27 nuclei and for one orientation of the crystal in fields up to 2000 gauss; the feasibility of checking this experimentally is discussed.

FT-NMR Detection of 45Sc, 49Ti and 93Nb in TiO2 Single Crystal

1998 ◽  
Vol 53 (6-7) ◽  
pp. 549-551
Author(s):  
K. Sato ◽  
S. Takeda ◽  
S. Fukuda ◽  
T. Minamisono ◽  
M. Tanigaki ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Stable Isotope ◽  
Single Crystal ◽  
Field Gradient ◽  
Quadrupole Moment ◽  
Electric Quadrupole ◽  
Quadrupole Coupling Constant ◽  
Electric Quadrupole Moment ◽  
Coupling Constant ◽  
Quadrupole Coupling

Abstract In order to determine the electric quadrupole moment of the short-lived β-emitter 41Sc from the quadrupole coupling constant in TiO2 , we measured the field gradient by detecting the Fourier-Transformed-NMR of stable isotope 45Sc doped in TiO2. Also, in order to study the electronic structure of impurities systematically, EFGs were measured for 45Sc, 49Ti and 93Nb in a TiO2 ingle single crystal.

Nuclear Quadrupole Interactions of 27Al in Alexandrite Single Crystal

1998 ◽  
Vol 53 (6-7) ◽  
pp. 568-572 ◽  
Author(s):  
T. H. Yeom ◽  
S. H. Choh ◽  
K. S. Hong ◽  
H. Y. Yeom ◽  
Y. H. Park ◽  
...  
Keyword(s):  
Single Crystal ◽  
Asymmetry Parameter ◽  
Quadrupole Coupling Constant ◽  
Coupling Constant ◽  
Experimental Accuracy ◽  
Quadrupole Interactions ◽  
Nuclear Quadrupole Interactions ◽  
Nuclear Quadrupole Coupling Constant ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

Abstract In an alexandrite single crystal four sets of NMR spectra for 27Al (I=5/2) were observed in the crystallographic ab, be, and ca planes. The AI (I) center has four magnetically inequivalent Al sites, whereas the AI (II) center has two. The nuclear quadrupole coupling constant and asymmetry parameter of Al(I) and AI(II) in an alexandrite crystal were determined. Within the experimental accuracy, our parameters turned out to have the same values as those of a chrysoberyl crystal.

Improved Rotational Constants and Dipole Moment and a Nuclear Quadrupole Coupling Analysis of 2-Cyanothiophene and Dipole Moment of 2-Cyanofurane

1977 ◽  
Vol 32 (2) ◽  
pp. 152-155 ◽  
Author(s):  
J. Wiese ◽  
L. Engelbrecht ◽  
H. Dreizler
Keyword(s):  
Dipole Moment ◽  
Stark Effect ◽  
Dipole Moments ◽  
Quadrupole Coupling Constant ◽  
Rotational Constant ◽  
Coupling Constant ◽  
Frequency Range ◽  
Effect Analysis ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

Results of a microwave investigation of the molecules 2-Cyanothiophene and 2-Cyanofurane are reported. The microwave spectrum of 2-Cyanothiophene was examined in the frequency range of 13 -40 GHz mainly to get a more accurate rotational constant A from the assignment of μb-btransitions. From the resolved hyperfine structure due to nuclear quadrupole coupling of the 14N-nucleus the quadrupole coupling constant X+=Xbb + Xcc was determined for 2-Cyanothiophene. No information for X- was available from the measured transitions.From Stark effect studies the dipole moments were determined for both molecules. The nuclear quadrupole coupling as a perturbation of the second order Stark effect was included in the Stark effect analysis

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