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21 September 2004 Femtosecond laser UV photochemistry of TNT deposits: the role of hydroxyls
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The photochemistry of TNT in toluene, water and methanol has been studied with femtosecond laser spectroscopy, surface reflection Fourier transform infrared absorption spectroscopy and ultraviolet-visible absorption spectroscopy measurements. Aqueous and alcoholic TNT solutions change from colorless to yellow or red upon irradiation with ultrafast 266.7 nm laser pulses. Irradiated aqueous or alcoholic TNT solutions exhibit increased absorption of light above 300 nm. Surface reflection FTIR measurements of dry deposits of irradiated samples are consistent with the formation of amines or alcohols in the photochemistry of TNT in aqueous or alcoholic solutions. In contrast, no evidence is observed in post irradiation UV-visible absorption or surface reflection FTIR measurements of TNT in toluene samples exposed to 266.7 nm femtosecond laser pulses. The results suggest that the hydroxyl group is involved in the formation of photoproducts of TNT photolysis. In addition, the results suggest that femtosecond laser photolysis is suitable for TNT detection in wet media.
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Lewis Mortimer Gomez, Alberto Santana, Nairmen Mina, Samuel P. Hernandez-Rivera, and Miguel E. Castro "Femtosecond laser UV photochemistry of TNT deposits: the role of hydroxyls", Proc. SPIE 5415, Detection and Remediation Technologies for Mines and Minelike Targets IX, (21 September 2004);

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