Author/Authors :
Johnston، نويسنده , , M.B and Herz، نويسنده , , L.M and Khan، نويسنده , , A.L.T and Kِhler، نويسنده , , A and Davies، نويسنده , , A.G and Linfield، نويسنده , , E.H، نويسنده ,
Abstract :
Low-energy vibrational modes have been investigated in polycrystalline biphenyl, para-terphenyl, para-quaterphenyl and para-sexiphenyl using THz time-domain spectroscopy (THz-TDS). A number of both internal and external infrared-active modes were observed for wavenumbers ranging between 20 and 80 cm−1. The temperature dependence of these modes is consistent with structural phase transitions occurring in the molecular crystal, indicating that THz-TDS is a sensitive probe of the conformation of conjugated molecular systems.
