文献类型：期刊文献

英文题名：Reactive and inelastic scattering dynamics of hyperthermal O and O2 from a carbon fiber network

作者：Poovathingal, Savio J.[1];Qian, Min[2];Murray, Vanessa J.[3];Minton, Timothy K.[4]

机构：[1]Dept Mech Engn, 287 Ralph G Anderson Bldg, Lexington, KY 40506 USA;[2]East China Univ Sci & Technol, Sch Sci, Dept Phys, Shanghai 200237, Peoples R China;[3]Montana State Univ, Dept Chem & Biochem, Bozeman, MT 59717 USA;[4]Univ Colorado Boulder, Ann & HJ Smead Dept Aerosp Engn Sci, 3775 Discovery Dr, Boulder, CO 80303 USA

年份：2021

卷号：183

起止页码：277

外文期刊名：CARBON

收录：;EI(收录号：20212910654598);WOS:【SCI-EXPANDED(收录号:WOS:000705083800029)】；

基金：This work was supported by NASA (Grant Nos. NNX15AD77G and 80NSSC18M0065). The experimental data were collected and much of the analysis was completed when all the authors were affiliated with Montana State University Bozeman. The authors would like to acknowledge Prof. Kelly A. Stephani and Dr. Krishnan Swaminathan-Gopalan for insightful discussions.

语种：英文

外文关键词：Carbon oxidation; Carbon ablation; Carbon preform; Gas-surface interactions; Molecular beam scattering

摘要：Pulsed beams containing O and O-2 with incident velocities of similar to 7900 m s(-1) were directed at a carbon fiber preform network (FiberForm) at temperatures in the range, 1023-1823 K, and the products that scattered from the network were detected with a rotatable mass spectrometer as a function of their velocities and scattering angles. A beam containing pure Ar atoms was also directed at the network, allowing multiple-bounce effects in the absence of reaction to be characterized. Scattered O, O-2, and Ar exhibited the dynamical characteristics of impulsive (non-thermal) scattering and thermal desorption (TD). On the other hand, CO and CO2 exhibited only TD dynamics. The fluxes of all products were quantified as a function of sample temperature and, for two focus temperatures, as a function of scattering angle. CO was the dominant reactive product. A temperature dependent hysteresis in the CO flux was quantified, and a comparison was made between the hysteresis on the carbon fiber network and on a planar vitreous carbon surface. The new results may be used to increase the fidelity of oxygen-carbon ablation models for hypersonic flight. (C) 2021 Published by Elsevier Ltd.