Reversible Photodegradation of 1-amino-2-methylanthraquinone
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The reversible photodegradation of 1-amino-2-methylanthraquinone (Disperse Orange 11) in solid poly(methyl methacrylate) under second-harmonic Nd: YAG laser excitation is investigated. 

Disperse Orange 11 has an absorption peak at 470nm and amplified spontaneous emission (ASE) at 645nm, yielding a stokes shift of 175nm which reduces reabsorption of ASE by the bulk material. Experiments show the novel result that after photodegradation the sample recovers fully. 

This superior stability is likely related to the creation of new species absorbing at shorter and longer wavelengths relative to the original absorption peak. We use photochromism to gain an understanding of how recovery takes place.

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