Oxygen isotope effect in high-T C superconductors: Cu nuclear quadrupole resonance relaxation rates

2000 ◽  
Vol 19 (3-4) ◽  
pp. 297-304 ◽  
Author(s):  
T. Ohno ◽  
K. Asayama
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Oxygen Isotope ◽  
Isotope Effect ◽  
Relaxation Rates ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole ◽  
Resonance Relaxation

The Complex between Chloromethane and Benzene

1986 ◽  
Vol 41 (1-2) ◽  
pp. 208-210 ◽  
Author(s):  
Daniel Rupp ◽  
Edwin A. C. Lucken
Keyword(s):  
Raman Spectroscopy ◽  
Temperature Dependence ◽  
Nuclear Quadrupole Resonance ◽  
Isotope Effect ◽  
Crystalline Phase ◽  
Enthalpy Of Fusion ◽  
Deuterium Isotope Effect ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

35Cl Nuclear Quadrupole Resonance, NQR, spectra of mixtures of Chloromethane and Benzene, with relative molar compositions in the range 1:3 to 3:1, and at temperatures in the range 77 K to 180 K, reveals the presence of a new crystalline phase, in addition to that of pure Chloromethane. The temperature-dependence and the deuterium isotope effect of this new resonance show that the chloromethane molecule is much more labile in the new crystalline phase than in pure chloromethane. The existence of the new crystalline phase is confirmed by Differential Thermal Approach, DTA, which in addition provides evidence that the complex has a 1:1 composition and that the enthalpy of fusion is ≈ 660 cal./mole. Raman spectroscopy provides further evidence of the existence of the complex.

35Cl and 37Cl Pure Quadrupole Resonance in α-CH2ClCOOH: Hydrogen Bonding and Chlorine Isotope Effect

1978 ◽  
Vol 33 (1) ◽  
pp. 74-77 ◽  
Author(s):  
Helmut Rager
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Temperature Dependence ◽  
Bond Length ◽  
Nuclear Quadrupole Resonance ◽  
Isotope Effect ◽  
Unit Cell ◽  
Chlorine Atoms ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

The temperature dependence of the pure nuclear quadrupole resonance of 35Cl and 37Cl in solid α-CH2ClCOOH has been measured from 77 K to 298 K. The NQR spectrum consists of a doublet arising from the two nonequivalent chlorine atoms in the unit cell. The temperature dependence was calculated using the Bayer-Kushida theory which gives a satisfactory fit to the NQR spectra in the temperature range investigated. From the NQR data evidence of an isotope effect was found for both nonequivalent chlorine atoms. The isotope effect depends on the C-Cl bond length and its direction probably on the state of binding of the chlorine atoms. The NQR results and their interpretation are consistent with the crystal structure of α- CH2ClCOOH.

Remote nuclear quadrupole resonance in solids

1993 ◽  
Vol 163 (10) ◽  
pp. 95 ◽  
Author(s):  
Vadim S. Grechishkin ◽  
Nikolai Ya. Sinyavskii
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole
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