Abstract
Reflectivity spectra of Se have been measured at pressures up to 16 GPa using a diamond anvil cell. Optical conductivity spectra have been derived from the reflectivity by using an oscillator fitting analysis. In the amorphous phase, a broad peak assigned to the lone-pair to σ∗ optical transitions shifts to lower energy and grows with increasing pressure. When amorphous Se is transformed into the metallic phase around 12 GPa, a Drude term appears in the low-energy region.
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