Molecular Reorientation in Solid Chlorine

1973 ◽  
Vol 51 (21) ◽  
pp. 2300-2305 ◽  
Author(s):  
R. T. Obermyer ◽  
E. P. Jones
Keyword(s):  
Temperature Dependence ◽  
Nuclear Quadrupole Resonance ◽  
Raman Spectra ◽  
Relaxation Times ◽  
Spin Lattice Relaxation ◽  
Molecular Reorientation ◽  
Librational Mode ◽  
Resonance Frequencies ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Nuclear quadrupole resonance frequencies and relaxation times of 35Cl and 37Cl in solid chlorine have been measured from 4.2 °K to near the melting point. An analysis of the temperature dependence of the nuclear quadrupole resonance frequencies was made using values for three librational mode frequencies determined previously from Raman spectra. The frequency of a fourth mode was predicted from this analysis. The spin–lattice relaxation times were analyzed using the Bayer model extended by Woessner and Gutowsky and using the librational mode frequencies determined from Raman spectra and the temperature dependence of the nuclear quadrupole resonance frequencies.

Potassium hexachloropalladate and potassium hexachloroplatinate: a comparative study using nuclear quadrupole resonance

1969 ◽  
Vol 47 (20) ◽  
pp. 2165-2169 ◽  
Author(s):  
Robin L. Armstrong ◽  
Douglas F. Cooke
Keyword(s):  
Temperature Dependence ◽  
Nuclear Quadrupole Resonance ◽  
Lattice Relaxation ◽  
Nuclear Quadrupole Resonance Frequency ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Lattice Mode ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Measurements of the temperature dependence of the nuclear quadrupole resonance frequency νQ and spin–lattice relaxation time T1 of the 35Cl nuclei in powdered samples of K2PdCl6 are reported. The data are qualitatively similar to earlier results for K2PtCl6 and are analyzed in the same manner. The temperature dependence of both νQ and T1 are dominated by the F1g rotary lattice mode of frequency ~ 41 cm−1. The data for K2PdCl6 and K2PtCl6 are compared and the parameters characterizing the NQR behavior tabulated. It is suggested that the quantitative explanation of the rather small differences observed might provide a challenging problem for a molecular orbital theorist.

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.

Sign in / Sign up

Export Citation Format

Share Document