Stability of S_xSe_y ring clusters studied by Raman scattering

The compound clusters of S_xSe_y have been crystallized by vacuum distillation. The raman scattering was measured from samples deposited along the region of the temperature gradient. The results show a systematic shift of the spectral peaks along the gradient, indicating that the S_xSe_{8 - x} with the larger values of x crystallized at lower temperatures. The crystal is in a rhombic structure which is not reported in the literature. Our experiments with liquid chromatography show that they are not stable in solution and are difficult to separate into single phases in solid form.