
%0 Journal Article
%A Bastow, TJ 
%A Campbell, ID 
%A Whitfield, HJ 
%T An arsenic-75 nuclear quadrupole resonance study of &#945; and &#946; As<sub>4</sub>S<sub>3</sub>
%J Australian Journal of Chemistry
%D 1972/11/01
%V 25
%N 11
%P 2291-2299
%K 
%R https://doi.org/10.1071/CH9722291
%U https://www.publish.csiro.au/paper/CH9722291 
%X The nuclear quadrupole resonance frequencies of 75As in the &#945; and &#946; forms of As4S3 have been measured at 77, 195, and 293 K. The frequencies at 77 K were:   &#945; phase 64.87 65.94 79.56 MHz  &#946; 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 &#945; and &#946; 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. 
