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Photoemission measurements on copper phthalocyanine films were made for photon energies of 7–23 eV. The spectral quantum yield was determined. The energy distribution of the photoemitted electrons for photon energies above 16 eV shows structure characteristic of the density of states. In addition, the attenuation length of electrons photoinjected into copper phthalocyanine was measured. For electrons of approximately 1.5 eV above the vacuum level, the electron-electron mean free path is estimated to be 11 Å.
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Pong et al. (1973) studied this question.
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