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Photoemission of holes from various metals into the organic polymer poly-N-vinyl-carbazole has been observed. The photoemission threshold was measured to be 1.28 eV for Au, 1.48 eV for Cu, and 1.53 eV for Al. The position of the valence-band edge relative to the vacuum level is calculated to be 6.1 ±{} 0.4 eV. A periodic fine structure in the spectral dependence of the quantum yield is attributed to the splitting of the electronic energy levels by molecular vibrations.
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Lakatos et al. (1968) studied this question.
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