Abstract
Coal and polycyclic aromatic hydrocarbon (PAH) fluorescence was excited by 442 nm laser light at flux density of ≈ 27 kW/m 2. Illuminating various coals in vacuum at ≈ 1 Pa caused a small decrease in their fluorescence. In air or oxygen a very rapid decrease in fluorescence was followed by slow fluorescence growth. This growth was faster for lower rank coals. Physically reversible oxygen attachment enhanced the fluorescence. Similar results were obtained with anthracene, phenanthrene and pentacene layers. A photo-reaction mechanism is proposed to explain features of the positive alteration of coal and PAH fluorescence in oxygen.
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