Two-step sequential excitation of fluorescence was produced in ICl vapor using two synchronized tunable laser sources. The pumping scheme involved the E←A←X electronic transitions with subsequent E→A transitions being observed in fluorescence.
NO(2) fluorescence measurements have been made in a CH(4)/O(2)/N(2) flame at atmospheric pressure using a pulsed tunable dye laser. The results indicate that it should be possible to achieve sub-ppm sensitivities for NO(2) in flames using currently available lasers.
A study is reported of the degradation of irradiated methacrylate polymers, the formation and trapping of free radicals, and their electron spin resonance (e.s.r.) spectrum. Several different radicals are apparently formed and it seems necessary to assume that they are formed by different mechanisms. This is also suggested by a number of observations of main chain degradation and the ratio of chain scission to ester removal for several methacrylate polymers. It is probable that several mechanisms of degradation and radical formation are operative and the one which predominates is dependent on the pendant ester structure.
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