Abstract
The hydrostatic-pressure shift of the zero-phonon lines of single terrylene molecules in a p-terphenyl host crystal was measured at 1.6 K. We found four inhomogeneous absorption bands of the terrylene molecules in p-terphenyl with inhomogeneous widths between 15 and 33 GHz, corresponding to four crystal sites, and we measured the pressure shift of single molecules in the sites X 2, X 3, and X 4. All the molecules investigated (35 in total) exhibited a linear and reversible red-shift with increasing pressure, with magnitudes between −0.92 and −1.48 MHz/hPa. The pressure shift parameter was found to be independent of the spectral position of the molecules.
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