Determination of the dielectric tensor function of triclinic CuSO4∙5H2O

We present the first successful dispersion analysis of a triclinic crystal in the infrared spectral region.The corresponding scheme involves the parallel evaluation of 12 polarized reflection spectra recordedfrom three mutual perpendicular faces of a cube-shaped crystal. The dispersion analysis was carried outon a CuSO4·5H2O single crystal. The determined oscillator parameters and the corresponding dielectricfunction tensor were used to model the spectra of polycrystalline CuSO4·5H2O. The good correspondencebetween modeled and experimental spectra of the polycrystalline species proves the correctness of theapproach.