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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 23, Number 10
BKCSDE 23(10)
October 20, 2002 

Relationships between the Raman Excitation Photon Energies and Its Wavenumbers in Doped trans-Polyacetylene
Jin-Yeol Kim, Eung-Ryul Kim, Dae-Woo Ihm, Mitsuo Tasumi
Polyacetylene, Raman spectroscopy
The resonance Raman spectra of trans-polyacetylene films doped heavily with electron donor (Na) and acceptor (HClO4) have been measured with excitation wavelengths between 488- and 1320-nm, and the relationships between the Raman excitation photon energies (2.54-0.94 eV) and its wavenumbers were discussed. We found the linear dependence of the Raman shifts with the exchanges of excitation photon energies. In particular, the Raman wavenumbers in the C=C stretching ( ν1 band) showed a dramatic decrease with the increase in Raman excitation photon energies. In the case of acceptor doping, its change is larger than that of donor doping. The observed wavenumber (1255-1267 cm-1 ) of the ν2 band (CC stretch) of Na-doped form is lower than that of the corresponding band (1290-1292 cm-1 ) of its pristine trans-polyacetylene, whereas the contrary is the case for the HClO4 doped form (1295-1300 cm-1 ). The origin of doping-induced Raman bands is discussed in terms of negative and positive polarons.
1404 - 1408
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