Die Temperaturabhängigkeit der Kernquadrupolkopplungskonstante von Na23 in Natriumnitrit, NaNO2

1962 ◽  
Vol 17 (9) ◽  
pp. 794-798 ◽  
Author(s):  
Alarich Weiss ◽  
D. Biedenkapp
Keyword(s):  
Asymmetry Parameter ◽  
Transition Point ◽  
Quadrupole Coupling Constant ◽  
Coupling Constant ◽  
Point Charge Model ◽  
Nuclear Quadrupole Coupling Constant ◽  
Charge Model ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Increasing Temperature

The nuclear quadrupole coupling constant of Na23 in sodium nitrite. NaNO2. has been investigated between 18 °C and 215 °C. Below the transition temperature (163 ± 2)°C the asymmetry parameter η= (φxx — φyy)/φzz decreases with increasing temperature and goes to zero at the transition point. Above 163 °C η is negative and | η | increases with temperature. This temperature dependence of the nuclear quadrupole coupling cannot be explained adequately by the point charge model together with the assumption of the free rotation of the NO2-group above the transition point.

Temperature Dependence of 14N NQR and Phase Transitions in KNO2 Powder

1996 ◽  
Vol 51 (5-6) ◽  
pp. 769-772 ◽  
Author(s):  
Hae Jin Kim ◽  
Kee Tae Han ◽  
Sung Ho Choh
Keyword(s):  
Phase Transitions ◽  
Temperature Dependence ◽  
Asymmetry Parameter ◽  
Quadrupole Coupling Constant ◽  
Coupling Constant ◽  
Nuclear Quadrupole Coupling Constant ◽  
Quadrupole Coupling ◽  
Two Temperatures ◽  
Nuclear Quadrupole

Abstract The temperature dependence of 14N NQR, measured at 77 to 300 K, is in better agreement with the model proposed by Blinc et al. than the Bayer theory. The nuclear quadrupole coupling constant and asymmetry parameter show a discontinuity at about 160 K and 230 K, respectively. The linewidths are broadened at these temperatures up to 22 kHz and 18 kHz, respectively. These results indicate that KNO2 undergoes phase transitions at these two temperatures.

Distribution of Electric Field Gradient at Aluminum Sites in Zeolite Loaded with Potassium

2002 ◽  
Vol 57 (6-7) ◽  
pp. 495-498 ◽  
Author(s):  
M. Igarashi
Keyword(s):  
External Field ◽  
Asymmetry Parameter ◽  
Quadrupole Coupling Constant ◽  
Central Line ◽  
Coupling Constant ◽  
First Order ◽  
Nuclear Quadrupole Coupling Constant ◽  
Quadrupole Coupling ◽  
Zeolite Lta ◽  
Nuclear Quadrupole

In the zeolite LTA, loaded with potassium, the temperature and field dependence of 27Al NQR was observed. Symmetrical single shoulders are found on both sides of the central line. The shape and the shift of those shoulders show no dependence on both temperature and the strength of the external field. This evidences a first order electric quadrupolar shift, being the result of the distribution of the nuclear quadrupole coupling constant and the asymmetry parameter at 27Al sites

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.

Weak Complexes of Dinitrogen: An Approach to the 14N-Nuclear Quadrupole Coupling Constant of Free N2

1992 ◽  
Vol 47 (1-2) ◽  
pp. 367-370 ◽  
Author(s):  
A. C. Legon ◽  
P. W. Fowler
Keyword(s):  
Ground States ◽  
Zero Point ◽  
Quadrupole Coupling Constant ◽  
Coupling Constants ◽  
Coupling Constant ◽  
Nuclear Quadrupole Coupling Constant ◽  
Quadrupole Coupling ◽  
Weak Complexes ◽  
Nuclear Quadrupole

AbstractThe 14N-nuclear quadrupole coupling constants χaa(14N<2>) and χaa(14N(1)) for the ground-states of the dimers 14N(2)14N(1) • • • HCCH and 14N(2)14N(1) • • • HC15N have been corrected for zero-point effects and for the electrical effects of the subunit HX to give two estimatesχ(14N) = -5.01 (13) and - 5.07 (8) MHz, respectively, for the coupling constant of the isolated 14N2 molecule

Rotationskonstante und Kernquadrupolkopplungskonstante des Trimethylehlorsilans, bestimmt aus Mikrowellenspektren / Rotational Constant and Nuclear Quadrupole Coupling Constant of Trimethylchlorosilane, Determined by Microwave Spectrum

1973 ◽  
Vol 28 (7) ◽  
pp. 1230-1232
Author(s):  
Werner Zeil ◽  
Bernhard Haas
Keyword(s):  
Quadrupole Splitting ◽  
Quadrupole Coupling Constant ◽  
Rotational Constant ◽  
Microwave Spectrum ◽  
Coupling Constant ◽  
Nuclear Quadrupole Coupling Constant ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

The microwave spectrum of trimethylchlorosilane has been investigated between 8 and 20 GHz. The quadrupole splitting of the K = 0 lines of the transitions J = 2 → 3 and 3 → 4 have been determined. The quadrupole coupling constant of the Cl-35 atom is determined to -34.701 MHz, and the rotational constant is determined to B0 = 2197.382 MHz.

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