摘要：
Optical properties of single-crystal monoclinic CuO in the range 70–6000cm-1 were studied at temperatures from 7 to 300 K. Normal reflection spectra were obtained from the (001) and (010) crystal faces thus giving separate data for the Au and Bu phonon modes excited in the purely transverse way (TO modes). Mode parameters, including polarizations of the Bu modes not determined by the crystal symmetry, were extracted by the dispersion analysis of reflectivity curves as a function of temperature. Spectra of all the components of the optical conductivity tensor were obtained using the Kramers-Kronig method recently extended to the case of the low-symmetry crystals. The number of strong phonon modes is in agreement with the factor-group analysis for the crystal structure currently accepted for the CuO. However, several "extra" modes of minor intensity are detected; some of them are observed in the whole studied temperature range, while existence
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