SINGLE-MOLECULE SPECTROSCOPY - PRESSURE EFFECT ON PENTACENE IN P-TERPHENYL

The hydrostatic pressure-induced shift of the zero-phonon line of single pentacene molecules in a p-terphenyl host crystal was studied at cryogenic temperatures. Five molecules in the inhomogeneously broadened S1<--S0 absorption band of the O1 site (592.32 nm) were selected. In the low-pressure regime (DELTAp less-than-or-equal-to 600 hPa), all molecules showed a linear and reversible frequency shift to the red, varied from -0.74 to -1.0 MHz/hPa.