Dye sensitised solar cells offer the prospect of low cost renewable energy harvesting, with power conversion efficiencies currently exceeding 12 %. Such cells operate by separating charge from a photoexcited dye monolayer into a high surface area transparent semiconductor substrate and a hole transporting medium. Performance appears to be affected by fast reorganisations of anchored molecules at the surface which affect charge transport. This proposal seeks to directly measure the geometry and timescale of such partial rotational and torsional motions to complement our computer simulations of the mechanism and performance of dye cells. We have selected two model dyes supported by TiO2 nanocrystals and immersed in deuterated acetonitrile for this study. Our findings will contribute to a fundamental understanding of charge transport and thus engineering of high performance dye cells.