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We present results for two-photon photoelectron spectroscopy of thin regioregular poly-3-hexyl-thiophene films on a gold metal substrate. The photoemission quantum yields are orders of magnitude larger than that of bare gold at the same laser intensity. Furthermore, we observe a strong increase of the quantum yield with increasing film thickness accompanied by a decreasing yield slope with respect to laser power. Our findings can be understood by assuming the creation of a long-lived intermediate state excitation that couples to the metal surface. This view is further supported by the dependence of the electron kinetic energy spectra on the laser photon energy.
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Sohn et al. (2003) studied this question.
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