Theodore Dibble - Understanding OH Yields in Electron Beam Irradiation of Humid N2

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      Publication Details (including relevant citation   information):

      Plasma   Chemistry and Plasma Processing

      DOI 10.1007/s11090-010-9268-x  (online version)

      Karen L. Schmitt and Theodore S. Dibble


      Recent   experimental work by Hakoda et al. attempted to determine the   G-value of OH radical in electron-beam irradiation of humid   N2 using the conversion   of CO to CO2 to titrate OH. Kinetic   modeling is used to simulate the experiment of Hakoda et al. in   an attempt to determine the validity of their assumptions and the   reason the observed G-value was higher than expected. The model   predicts CO2 production that is   roughly 25% lower than observed and OH   production about 10% higher than concluded from experimental   data. This apparent contradiction is resolved by understanding   the detailed chemistry of the OH + CO reaction and the   fate of the thermalized HOCO intermediate. Analysis of   the reactions producing OH   indicate that the sources of OH are significantly different in   humid air than in humid N2 and the G-value for OH   is much higher in humid air than humid   N2.

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