The photoreduction of methylene blue by a ruby laser light has been studied. The kinetic treatment and the measurement of the apparent activation energy show that, under the high-intensity irradiation, the excited triplet state of methylene blue plays a main role in the photoreduction by p-chloro phenylglycine. The apparent activation energy of the reduction of methylene blue is reduced from 7.4 to 2.8 kcal as the laser light energy increases from 23 to 530 mJ.
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Obi et al. (1972) studied this question.
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