## Files in this item

FilesDescriptionFormat

application/pdf

5151.pdf (17kB)
(no description provided)PDF

## Description

 Title: Single Substitution Kinetic Isotope Effect Measurements For Ch4 + O(1d) Using Cavity Ring-down Spectroscopy Author(s): Ober, Douglas Contributor(s): Okumura, Mitchio; Bui, THINH; SHEN, LINHAN; Chen, TzuLing Subject(s): Dynamics and kinetics Abstract: As the most abundant atmospheric hydrocarbon and potent greenhouse gas, methane plays a major role in the chemistry of Earth’s atmosphere. The study of kinetic isotope effects (KIEs) for H–D and $^{12}$C–$^{13}$C substitutions on the reaction rates for methane is of importance for modelers, but is challenging because the effects are small, and producing methane oxidants results in a variety of secondary chemistry. In this work, single and double substitution methane KIEs for $^{13}$CH$_{4}$ and CH$_{2}$D$_{2}$ and were produced using the flash photolysis of N$_{2}$O and the methane isotopic compositions were determined via frequency-stabilized cavity ring-down spectroscopy using a dual wavelength near-IR DBF laser system. The KIE of $^{13}$CH$_{4}$ was found to differ with the literature value at room temperature of 1.013 by a factor of two, and the H-D KIE of CH$_{2}$D$_{2}$ was measured for the first time to be 1.098(23). Further, the expected lack of a temperature-dependence of the KIE over the range 170 – 300 K was seen as expected. Issue Date: 2021-06-23 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111103 Date Available in IDEALS: 2021-09-24
﻿