ID#: 126
Abstract Title: Rate Coefficient Measurements of the Reaction H + O2 + M = HO2 + M from 950K to 1200K
Session Title: Chemistry in Flames II
Session Date: 8/1/01
Session Start Time: 2:00 PM
Contributing Author: Rabinowitz, M.J.
Organization: NASA Glenn Research Center
Country: USA
Authors: M.J. Rabinowitz, S.M. Hwang, J.A. Cooke, K.J. DeWitt
Short Abstract: Rate coefficients of the reaction H + O2 + M = HO2 + M were measured behind reflected shock waves in a series of very lean H2 - O2 - Ar mixtures (phi = 0.0125 - 0.025). Hydroxyl radical temporal behavior was monitored using 310 nm light (P1(5) line of the (0,0) band of the OH A2S<-X2P transition) from an intracavity doubled ring dye laser operating in a standard double- beam plus frequency reference mode. Experimental mixtures and conditions were chosen after an extensive sensitivity study. The rate coefficient expression is k/[M] = 7.55 x 1017 T-0.8 cm6 mol- 2 s-1 with uncertainty of 30% in the temperature and density range of 950 - 1200 K and 15 - 51 x 10-6 mol cm-3, respectively. Our results are consistent with the upper range of published values and extrapolation of our expression agrees well with flow reactor studies performed at room temperature. Details of the experimental results and data analysis along with critical analysis and comparison to previous studies will be presented.