Effect of Surface Condition on the Fluorescence and Surface Photoconductivity of Anthracene

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Abstract
When large crystals of anthracene are polished with abrasive powders and solvents, and are then exposed to air or oxygen for several days, the intensity of fluorescence and the hard vacuum value of the surface photoconductivity decrease markedly. With cleaved crystals or crystals grown from solution, however, the fluorescence remains unchanged, and the photocurrent alters in a different fashion. It is suggested that the abrasion of the polishing process facilitates the production of a film of anthracene peroxide or anthraquinone, which in turn causes the effect observed.

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