Abstract
The far-infrared (FIR) reflectance of the charge-density-wave (CDW) conductor TaS{sub 3} has been measured from 3 to 700 cm{sup {minus}1}, over the temperature range from 15 to 300 K. For incident radiation polarized parallel to the long axis of the crystals, a strong reflection edge correlated with the formation of the CDW appears near 80 cm{sup {minus}1}. The associated conductivity shows the pinned acoustic phason near 0.5 cm{sup {minus}1} dominating {epsilon}({omega}) and an additional small mode near 9 cm{sup {minus}1}. The size of the latter mode is in sharp contrast to that observed in the related CDW materials (TaSe{sub 4}){sub 2}I and K{sub 0.3}MoO{sub 3}. These results rule out current models of a generic FIR mode'' in CDW excitations.
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