Polarized Absorption in Oriented 'New' (CH)x
PENNSYLVANIA UNIV PHILADELPHIA DEPT OF CHEMISTRY
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We have measured the temperature and polarization dependence of the infrared absorption in 500-stretched highly-conducting trans-CHx, doped chemically with iodine to levels up to 6 I3. These samples have highly anisotropic infrared conductivity, with substantially greater sigma 1omega for polarization parallel to the chain direction. The 300 K frequency-dependent conductivity has a narrow Drude-like peak at zero frequency above which is a broad midgap band with the usual doping-induced vibrational modes superimposed. When the temperature was lowered, the far-ir conductivity decreased in accord with dc measurements. The Drude-like peak was not seen below 200 K.
- Atomic and Molecular Physics and Spectroscopy