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Updated: Jun 25, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Polymorphism and phonon dynamics of alpha-quaterthiophene
Paolo Ranzieri1, Alberto Girlando, Silvia Tavazzi
1Dip. Chimica G.I.A.F. and INSTM-UdR Parma, Università di Parma, 43100 Parma, Italy.
Abstract:
Low-frequency (10-150 cm(-1)) Raman spectra of the low-temperature (LT) and high-temperature (HT) polymorphs of the organic semiconductor alpha-quaterthiophene at 300 and 10 K are reported. Polarized spectra, assisted by quasi-harmonic lattice dynamics (QHLD) calculations, allow characterization of the lattice phonon dynamics and identification of the two phases spectroscopically. The experimental data can be explained by taking into account the coupling between intermolecular (lattice) and low-frequency intramolecular modes. Finally, Raman mapping is used to investigate the phase purity.
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