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

6 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

Publisher Copyright:
© 2021

Keywords

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

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science

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