Abstract
Absorption coefficient measurements near the optical band edge of liquid iodine along the melting curve up to 1.52 GPa and 683 K are reported. An externally heated diamond anvil cell has been used to pressurize the sample. The spectra are dominated in the 4000--12000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ range by exponential tails of the Urbach type with strongly temperature-dependent slopes and amplitudes. The possibility of connecting the evolution of this spectral feature with the conductivity jumps recently observed in liquid iodine around 3--4 GPa is discussed.
Published Version
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