TY - JOUR T1 - Vibrational structure of organic semiconductors: the role of conjugation length JO - Brazilian Journal of Physics A1 - Borges, C. A. M. A1 - Marletta, A. A1 - Faria, R. M. A1 - GuimarĂ£es, F. E. G. SN - 0103-9733 UL - 10.1590/S0103-97332004000400013 VL - 34 Y1 - 2004 PB - Brasil ER -