田島 裕之

The polarized reflectance spectrum of β-(BEDT-TTF)2PF6 was measured over the spectral range from 720 cm-1 to 25, 000 cm-1 at 293 K (semiconductive phase) and at 318 K (metallic phase). The infrared band found in the conductivity spectrum, which was obtained by the Kramers-Kronig transformation of the reflectance data, is interpreted as the one associated with inter-band transition. © 1985.

The polarized reflectance spectrum of β-(BEDT-TTF)2I3 was measured over the spectral region from 720 cm-1 to 25,000 cm-1. The optical conductivity spectrum showed an infrared band strongly polarized along the [1̄10] axis. This is concluded to be due to an inter-band transition across the band gap. Discussion is given on the band. © 1985.

The polarized reflectance spectrum of a novel organic conductor, (BEDT-TTF)2ClO4(C2H3Cl3)0.5 was measured at room temperature over the spectral region from 340 cm-1 to 25000 cm-1. The reflectance spectrum provided an evidence for the anisotropic two-dimensional character of this material. The optical conductivity spectrum exhibits the existence of an optical band gap of about 0.2 eV, suggesting that this material is a semimetal rather than a metal. © 1984.