Low-energy vibrational modes in phenylene oligomers studied by THz time-domain spectroscopy

✍ Scribed by M.B Johnston; L.M Herz; A.L.T Khan; A Köhler; A.G Davies; E.H Linfield

• Book ID: 104108407
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 541 KB
• Volume: 377
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/s0009-2614(03)01136-9

✦ Synopsis

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 À1 . 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.