Abstract
We performed Raman spectroscopy on polycrystalline powders of bi-, para-ter-, para-quarter- and para-sexiphenyl under hydrostatic pressure up to 70 kbar and from 10 K to 300 K. We show that the crystallographic phase transition temperatures can be determined with our experimental method. Furthermore, we report a structural transition with pressure that we attribute to a change of the interring torsion potential from W- to U-shaped. The experimental findings are confirmed by calculated Raman spectra and interring torsion potentials for the isolated oligomers as well as for the corresponding polymer in crystalline phase.
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