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UV photoemission spectra of single crystals of polycyclic hydrocarbons were measured using two methods, 1) covering a sample with a thin layer of gold and 2) inducing photoconduction in the sample with low-energy light, to eliminate sample charging. Their ionization thresholds obtained are all smaller than the values for corresponding polycrystalline thin films.
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Schmid et al. (1983) studied this question.
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