Temperature Dependence of the Nuclear Quadrupole Resonance Frequencies in Para‐Dichlorobenzene

1966 ◽  
Vol 45 (9) ◽  
pp. 3370-3373 ◽  
Author(s):  
George G. Moross ◽  
Harold S. Story
Keyword(s):  
Temperature Dependence ◽  
Nuclear Quadrupole Resonance ◽  
Resonance Frequencies ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

An arsenic-75 nuclear quadrupole resonance study of α and β As4S3

1972 ◽  
Vol 25 (11) ◽  
pp. 2291 ◽  
Author(s):  
TJ Bastow ◽  
ID Campbell ◽  
HJ Whitfield
Keyword(s):  
Thermal Expansion ◽  
Temperature Dependence ◽  
Nuclear Quadrupole Resonance ◽  
Electrostatic Field ◽  
Β Phase ◽  
Field Gradients ◽  
Α Phase ◽  
Resonance Frequencies ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

The nuclear quadrupole resonance frequencies of 75As in the α and β forms of As4S3 have been measured at 77, 195, and 293 K. The frequencies at 77 K were: α phase 64.87 65.94 79.56 MHz β phase 65.42 67.16 79.65 MHz An analysis is presented in terms of Townes-Dailey theory and of the temperature dependence in terms of Bayer-Brown theory. The differences in frequencies of the α and β forms were attributed to the effect of electrostatic field gradients, estimated by lattice sums. Allowance must be made for the thermal expansion of the lattice to obtain a consistent interpretation.

Temperature dependence of the 35Cl nuclear quadrupole resonance frequencies of the trimeric and tetrameric phosphonitrilic chlorides

1967 ◽  
Vol 45 (14) ◽  
pp. 1669-1676 ◽  
Author(s):  
M. Kaplansky ◽  
M. A. Whitehead
Keyword(s):  
Temperature Dependence ◽  
Nuclear Quadrupole Resonance ◽  
Unit Cell ◽  
Crystallographic Data ◽  
Chlorine Atoms ◽  
Resonance Frequencies ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole ◽  
35Cl Nuclear Quadrupole Resonance

The 35Cl nuclear quadrupole resonance frequencies of the trimeric and tetrameric phosphonitrilic chlorides have been studied as a function of temperature. Two forms of the tetramer were used and the differences in their spectra ascribed to crystallographic effects. Correlation of each of the lines in the trimer to a set of chlorine atoms in the unit cell were attempted using crystallographic data.

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