Graduate Commencement Program 2004

Graduate Commencement exercises of Whitworth College in May 2004.https://digitalcommons.whitworth.edu/commencement-programs/1095/thumbnail.jp

KINETICS OF THE ETHYLPEROXY SELF REACTION AND REACTION WITH HO2 USING FREQUENCY MODULATED NEAR IR SPECTROSCOPY

Author Institution: California Institute of Technology; Jet Propulsion LaboratoryKinetics of the C2H5O2 + C2H5O2 and C2H5O2 + HO2 reactions have been studied using simultaneous FM detection of the 3v1 OH overtone stretch of HO2 and direct UV absorption of C2H5O2 at 250nm. Temperature dependence of the reactions will be discussed. Ab initio calculations have been performed on the reaction path and comparisons will be made to observed rate constants

KINETICS MEASUREMENTS OF HO2_2 AND RO2_2 SELF AND CROSS REACTIONS USING INFRARED KINETIC SPECTROSCOPY (IRKS)

Author Institution: Department of Chemistry, California Institute of Technology, Pasadena, CA 91125; Jet Propulsion Laboratory, Pasadena, CA 91109Reactions between RO$_2$ and HO$_2$ are important in the gas phase oxidation of volatile organics in the atmosphere. The rate constants for the reactions of HO$_2$ + C$_2$H$_5$O$_2$, and C$_2$H$_5$O$_2$ + C$_2$H$_5$O$_2$ were measured using a novel approach to radical radical reactions that employs two independent spectroscopic probes. HO$_2$ was monitored at 6638.2 cm$^{-1}$ using near-IR diode laser WM spectroscopy, and C$_2$H$_5$O$_2$ was monitored at 250 nm using UV absorption. Experiments were run under conditions relevant to the upper troposphere (221-298 K and 50-400 Torr). Measurements of the rate constants for both reactions as well as a measurement of the branching fraction leading to the alkoxy channel of the C$_2$H$_5$O$_2$ self reaction will be discussed. Preliminary results are: k$_{HC}$ = $(6.4\pm1.4)\times10^{-13}$ cm$^{3}$ molec$^{-1}$ s$^{-1}$ Exp(($601\pm120$)/ T ), k$_{CC}$ = $(1.10\pm0.20)\times 10^{-13}$ cm$^{3}$ molec$^{-1}$ s$^{-1}$ independent of temperature, and a branching fraction of $0.32\pm0.13$