Toulik Maitra et al. “Phonon spectra reveal how selective fluorination enhances hole transport in benzodithiophenes (BDT).” ChemRxiv (). https://doi.org/10.26434/chemrxiv.15006076/v2

BDT-H powder
INS (5 K, VISION indirect-geometry spectrometer) Broad 150–350 cm⁻¹ envelope