UV intensity measurement of 308 nm excimer lamp using chemical actinometer

Photohydrolysis of 3,4-dimethoxynitrobenzene in alkaline media is used for the determination of the ultraviolet UV. intensity from a xenon chloride excimer lamp providing intense narrow band radiation at ls308 nm XeCl).. The intensity measurement is based on UV spectral absorption measurement of the 2-methoxy-5-nitrophenolate anion formation from photohydrolysis of 3,4-dimethoxynitrobenzene. This actinometer is convenient for photolysis studies and measurements of UV intensities at wavelengths between 200–450 nm. A photokinetic model is presented for the reaction which is generally applicable for any two component photochemical system. The electrical power and distance dependence of the conversion degree and the UV intensity of the lamps was investigated. q1999 Elsevier Science B.V. All rights reserved