Compounds of SbSI type are of considerable interest for their semiconducting and ferroelectric properties. The lattice dynamics of these compounds was studied by various techniques and ambiguous results were obtained. The identification of the revealed infrared (IR) and Raman active modes was made by means of group theory /1 to 4/. In the ferroelectric phase of SbSI (space group C2? Soft mode behaviour was observed with the soft mode being coupled to optic /5, 6/ or acoustic /?/ vibrations, away from the Brillouin zone center in the latter case. In the paraelectric phase (space group Di$ mode softening also takes place, though the contribution of IR vibrations to the static dielectric constant of SbSI appears to be insufficient to satisfy the Lyddape-Sachs-Teller relation as well as the Curie-Weiss relation /1, 2, 8/. The contribution of the observed microwave resonance is necessary to satisfy both ones /9/. Recent full lattice dynamics model calculations for SbSI and SbSBr /4, lo/ stimulate anharmonic effect studies to reveal the mode coupling role on the phase transition in these compounds. This note deals with the electronic adiabatic potential of the paraelectric phase of SbSI. 9On the base of Herman's idea that atomic form factors can be used for obtaining electronic spectra in solids /ll/, a definition of the electronic potential was developed including quantities which could be measured by standard X-ray techniques in use. It was shown /12, 13/ that the Fourier expansion of the adiabatic electronic potential a t point f in the symmetry plane wave basis can be presented in the following way (at. units): 1)
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