Rotational Vibrations of Pyrazine from Temperature Dependent 14N Nuclear Quadrupole Resonance and X‐Ray Thermal Tensors

1971 ◽  
Vol 55 (4) ◽  
pp. 1984-1985 ◽  
Author(s):  
B. L. Barton
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Temperature Dependent ◽  
X Ray ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Chlorine nuclear quadrupole resonance lineshape in the cubic antifluorite K2OsCl6

1985 ◽  
Vol 63 (3) ◽  
pp. 350-353 ◽  
Author(s):  
Maximo E. Ramia ◽  
Robin L. Armstrong
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Point Defects ◽  
Temperature Dependent ◽  
Local Strains ◽  
Temperature Range ◽  
Quadrupole Resonance ◽  
Symmetric Line ◽  
Nuclear Quadrupole

Chlorine nuclear quadrupole resonance lineshapes are reported for the cubic antifluorite K2OsCl6 in the temperature range 70–300 K. For temperatures above 172 K the spectrum consists of a single symmetric line; for temperatures below 172 K an asymmetric line is observed which can be represented as a sum of two symmetric lines. The symmetric lines are temperature dependent mixtures of Lorentzian and Gaussian profiles. The explanation is that the nuclear quadrupole resonance lines observed in K2OSCl6 are inhomogeneously broadened by temperature dependent local strains caused by point defects and dislocations.

Halogen nuclear quadrupole resonance and structural relationships in some complex halides of zinc and copper

1972 ◽  
Vol 25 (11) ◽  
pp. 2301 ◽  
Author(s):  
WJ Asker ◽  
DE Scaife ◽  
JA Watts
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Mean Values ◽  
X Ray ◽  
Rubidium Salt ◽  
Structural Relationships ◽  
Quadrupole Resonance ◽  
The Mean ◽  
Nuclear Quadrupole

X-ray diffraction and halogen nuclear quadrupole resonance (n.q.r.) methods show that Rb3ZnBr5, (NH4)3ZnBr5, and CsZnI5 are isostructural with orthorhombic (NH4)3ZnCl5, and that Rb3ZnCl5 has the tetragonal Cs3CoCl5 structure. ZnI2,2NH3 is isomorphous with the corresponding chloride and bromide diammines. Rb2ZnBr4 and (NH4)2ZnBr4 have structures of Cs2ZnBr4 type, although the rubidium salt shows some stacking faults. In the complex chlorides 35Cl n.q.r. frequencies are grouped about 9 MHz, while the bromides have 81Br frequencies grouped around 60 MHz. The � → 3/2 transitions of 127I in the iodides are in the region of 76 MHz. The diammine compounds ZnBr2,2NH3 and ZnI2,2NH3 have frequencies close to the mean values for the ZnBr42- and ZnI42- ions respectively, but in the hydrates ZnCl2,l⅓H2O,ZnBr2,2H2O, β-KZnBr3,2H2O, and KZnI3,2H2O the halogen frequencies are increased. N.q.r. and X-ray data are also reported for the compound Cs3CuCl5, formed by quenching the melt. This compound slowly disproportionates at room temperature into Cs2CuCl4 and CsCl.

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