Optical absorption in SrC4H4O6·3H2O crystals

Study of optical absorption in the gel-grown strontium tartrate trihydrate (STT) single crystals measured in UV–vis range at room temperature reveals transitions involving absorption and emission of phonons. Based on the theory of interband optical absorptions, the electronic transition near the fundamental absorption edge is analysed. Some feeble disorder in the crystal is conceived to be present. The analysis carried out hereunder leads to estimation of energy of the lattice phonons involved.