Experimental and theoretical determination of the temperature dependence of deuteron and oxygen quadrupole coupling constants of liquid water

1995 ◽  
Vol 103 (16) ◽  
pp. 6941-6950 ◽  
Author(s):  
R. Ludwig ◽  
F. Weinhold ◽  
T. C. Farrar
Keyword(s):  
Temperature Dependence ◽  
Liquid Water ◽  
Coupling Constants ◽  
Theoretical Determination ◽  
Quadrupole Coupling

19F Nuclear Quadrupole Coupling in some Halomethanes

1986 ◽  
Vol 41 (1-2) ◽  
pp. 171-174 ◽  
Author(s):  
M. Frank ◽  
F. Gubitz ◽  
W. Ittner ◽  
W. Kreische ◽  
A. Labahn ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Simple Model ◽  
Temperature Dependence ◽  
Coupling Constants ◽  
Temperature Dependent ◽  
Distribution Method ◽  
Quadrupole Coupling ◽  
Time Differential ◽  
Nuclear Quadrupole

The 19F quadrupole coupling constants in CF4, CHF3, CClF3 and CHClF2 are reported. The measurements were carried out temperature dependent using the time differential perturbed angular distribution method (TDPAD). The temperature dependence can be satisfactorily described in the framework of the Bayer-Kushida theory. A simple model is used to explain the appearance of H-F and Cl-F coupling constants in CHF3/CHClF2 and CClF3, respectively.

scholarly journals A Theoretical Determination of the Characteristic Equation of Snow in the Pendular Regime

1990 ◽  
Vol 36 (123) ◽  
pp. 179-187 ◽  
Author(s):  
E.M. Morris ◽  
R.J. Kelly
Keyword(s):  
Characteristic Equation ◽  
Liquid Water ◽  
Volume Fraction ◽  
Theoretical Method ◽  
High Water ◽  
Liquid Water Content ◽  
Theoretical Determination ◽  
Natural Snow ◽  
Water Contents

AbstractRecent mathematical models treat a natural snow-pack as a mixture body consisting of solid ice grains, liquid water, and a gas made up of air and water vapour. Such a model requires two independent constitutive equations for the two independent volume fractions. However, so far only one equation, a power law relating the liquid-water content to capillary pressure, has been suggested, by analogy with the so-called “characteristic” equation for liquid water in soils. Experimental data from drainage tests on snow columns may be used to determine the characteristic equation for snow for relatively high water contents. However, the experimental method is not valid when water exists in isolated inclusions in the snow, i.e. in the pendular regime. In this paper a theoretical method is used to derive two independent volume-fraction laws for snow in the pendular regime.

NMR Determination of Some Deuterium Quadrupole Coupling Constants in Nematic Solutions

1972 ◽  
Vol 56 (7) ◽  
pp. 3249-3256 ◽  
Author(s):  
Francis Spencer Millett ◽  
Benjamin P. Dailey
Keyword(s):  
Coupling Constants ◽  
Quadrupole Coupling

New determination of quadrupole coupling constants of Li isotopes in single crystals LiIO3 andLiNbO3

1993 ◽  
Vol 78 (1-4) ◽  
pp. 159-163 ◽  
Author(s):  
T. Minamisono ◽  
T. Ohtsubo ◽  
Y. Nakayama ◽  
S. Fukuda ◽  
T. Izumikawa ◽  
...  
Keyword(s):  
Single Crystals ◽  
Coupling Constants ◽  
Quadrupole Coupling

Die Mikrowellen-Rotationsspektren des AgCl, AgBr und AgJ

1971 ◽  
Vol 26 (2) ◽  
pp. 240-244 ◽  
Author(s):  
J. Hoeft ◽  
F. J. Lovas ◽  
E. Tiemann ◽  
T. Törring
Keyword(s):  
Coupling Constants ◽  
Rotational Spectrum ◽  
Vibrational States ◽  
Molecular Constants ◽  
Quadrupole Coupling ◽  
Rotational Transitions

The observation of the low lying rotational transitions J = 0 →1 of AgCl and J = 2→3 of AgBr resulted in improved quadrupole coupling constants: 107, 109Ag35Cl: e qν Q (35Cl) = -36,50 (10) MHz (ν=0,1); 107.109Ag79Br; e q0 Q(79Br) =297,10(15) MHz, e q1 Q (79Br) =297,65 (15) MHz. In con­trast to former measurements of KRISHER and NORRIS we obtained the following constants of 107Ag79Br: Y01 = 1943,6420 (50) MHz, Y11 = -7,0745(70) MHz, re = 2,393100(29) Å. The unknown rotational spectrum of AgJ was found. Measurements of the transition J = 3 →4 in four vibrational states resulted in the determination of the following molecular constants: Y01 = 1345,1105(25) MHz, Y11= -4,2389(30) MHz, Y21 = 1,70(80) kHz, Y0,=-0,2540(2) kHz; re = 2,544611 (31) Å; e q0 Q(127J) =-1062,17(40) MHz, e q1 Q(127J) = -1064,81 (40) MHz.

Temperature Dependence of 2H Quadrupole Coupling Constants in 2H2O and Ionic Motions in Crystalline [M(2H2O)6] [SnCl6] (M: Mg, Ca), Studied by 2H NMR and Neutron Powder Diffraction

1998 ◽  
Vol 53 (6-7) ◽  
pp. 473-479 ◽  
Author(s):  
Naohiro Yoshida ◽  
Noriko Onoda-Yamamuro ◽  
Shin'ichi Ishimaru ◽  
Keizo Horiuchi ◽  
Ryuichi Ikeda
Keyword(s):  
Temperature Dependence ◽  
Powder Diffraction ◽  
Room Temperature ◽  
Neutron Powder Diffraction ◽  
Coupling Constants ◽  
H Nmr ◽  
Octahedral Cation ◽  
Quadrupole Coupling ◽  
Large Asymmetry ◽  
Motional Narrowing

Abstract The temperature dependence of 2H NMR spectra was measured at 130-430 K on [M(D2O)6] [SnCl6] (M : Mg, Ca) (rhombohedral, space group: R3̅), and neutron powder diffraction on the Mg salt was performed at room temperature. Based on the accurate orientation of D2O molecules in an octahedral cation, spectra with a large asymmetry parameter η, observed around 200 K, were explained by a model of 180° flip of water molecules. Another motional narrowing observed above room temperature was assigned to a cationic overall reorientation about the C3-axis.

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