Decomposition of Ozone by O(1D)

Abstract

Photometric measurements of ozone decomposition following flash photolysis of O.inert-gas mixtures are interpreted in terms of the time-dependent quantum yield. Decomposition occurs in time segments which contribute increments to the quantum yield that depend on temperature, pressure, and sample composition. A major portion of the reaction k~2.3X109liter/mole·sec is complete during the photolysis flash and has no temperature dependence in the range 205°-298°K. Processes which further enhance the quantum yield are much slower and depend on temperature, inert-gas pressure, and composition in a way that has some correlation with the effectiveness of the gas in deactivating vibrationallyexcited 02t. In N2 a factor of 2 less 0 3 is decomposed by the end of a flash than in He or Ar, indicating deactivation of the O(lD) by N2. The quantum yield is smaller in N2 than in He or Ar but qualitatively similar in its pressure dependence. Some limitations in accounting for the results by an energy chain mechanism are discussed.

One-step UV lithography for activation of inert hydrocarbon monolayers and preparation of protein micropatterns

“…First, the total percentage of oxygen-containing functional groups increases with the UV exposure time, which implies that an oxidization process is taking place on the OTS SAMs during the UV exposure. A possible mechanism for the occurrence of this oxidization process during UV exposure is that oxygen molecules dissociate under UV and become oxygen free radicals [39,40]. These high-energy species can readily react with OTS SAMs and form oxygen-containing groups.…”