Reactive and inelastic scattering dynamics of hyperthermal O and O2 from a carbon fiber network

Savio J. Poovathingal, Min Qian, Vanessa J. Murray, Timothy K. Minton

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Pulsed beams containing O and O2 with incident velocities of ∼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, O2, 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.

Original languageEnglish
Pages (from-to)277-290
Number of pages14
JournalCarbon
Volume183
DOIs
StatePublished - Oct 15 2021

Bibliographical note

Funding Information:
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.

Publisher Copyright:
© 2021

Keywords

  • Carbon ablation
  • Carbon oxidation
  • Carbon preform
  • Gas-surface interactions
  • Molecular beam scattering

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Science (all)

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