Model atomic oxygen reactions

Detailed experimental and theoretical studies of the reactions of ground-state O(3P) with H2, CH4, CH3CH3, and CH3CH 2CH3 at hyperthermal collision energies

Timothy K. Minton, Donna J. Garton, Diego Troya, Biswajit Maiti, Ronald Pascual, George C Schatz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The reactions of O(3P) with H2, CH4, CH3CH3, and CH3CH2CH3 at center-of-mass collision energies in the range 1.5-3.9 eV have been investigated with (1) crossed-beams experiments employing a laser-detonation source of O atoms and (2) various theoretical methods. We present here the first measurements of the relative excitation function for the O(3P) + H2 reaction, and the experimental results are in excellent agreement with accurate quantum wave packet calculations. The experiment-theory agreement confirms that the laser-detonation source produces oxygen atoms in the ground O(3P) state. For reactions of O(3P) with alkanes, the experiments provide evidence for previously unobserved reaction pathways which principally lead to O-atom addition and subsequent H-atom elimination or C-C bond breakage: O(3P) + RH - RO + H or R'O + R″. In addition, the expected H-atom abstraction reaction to form OH has been observed. The H-atom abstraction reactions have modest barriers in the range ∼0.1 - 0.3 eV, whereas the addition pathways have barriers greater than ∼1.8 eV. Nevertheless, theory predicts that abstraction and addition reactions occur with similar probabilities at the collision energies of these studies. We have thus far completed one in-depth study of such an addition reaction: O(3P) + CH4 - OCH3 + H. Although high barriers prevent the addition reactions from occurring in most thermal environments, such reactions might be important in low-Earth orbit, where spacecraft surfaces and exhaust gases suffer high-energy collisions with ambient atomic oxygen.

Original languageEnglish
Title of host publicationEuropean Space Agency, (Special Publication) ESA SP
Pages129-136
Number of pages8
Edition540
Publication statusPublished - 2003
EventProceedings of the 9th International Symposium on Materials in a Space Environment - Noordwijk, Netherlands
Duration: Jun 16 2003Jun 20 2003

Other

OtherProceedings of the 9th International Symposium on Materials in a Space Environment
CountryNetherlands
CityNoordwijk
Period6/16/036/20/03

Fingerprint

Ground state
Atoms
Addition reactions
Oxygen
Detonation
Wave packets
Lasers
Experiments
Exhaust gases
Paraffins
Spacecraft
Orbits
Earth (planet)

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Minton, T. K., Garton, D. J., Troya, D., Maiti, B., Pascual, R., & Schatz, G. C. (2003). Model atomic oxygen reactions: Detailed experimental and theoretical studies of the reactions of ground-state O(3P) with H2, CH4, CH3CH3, and CH3CH 2CH3 at hyperthermal collision energies. In European Space Agency, (Special Publication) ESA SP (540 ed., pp. 129-136)

Model atomic oxygen reactions : Detailed experimental and theoretical studies of the reactions of ground-state O(3P) with H2, CH4, CH3CH3, and CH3CH 2CH3 at hyperthermal collision energies. / Minton, Timothy K.; Garton, Donna J.; Troya, Diego; Maiti, Biswajit; Pascual, Ronald; Schatz, George C.

European Space Agency, (Special Publication) ESA SP. 540. ed. 2003. p. 129-136.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Minton, TK, Garton, DJ, Troya, D, Maiti, B, Pascual, R & Schatz, GC 2003, Model atomic oxygen reactions: Detailed experimental and theoretical studies of the reactions of ground-state O(3P) with H2, CH4, CH3CH3, and CH3CH 2CH3 at hyperthermal collision energies. in European Space Agency, (Special Publication) ESA SP. 540 edn, pp. 129-136, Proceedings of the 9th International Symposium on Materials in a Space Environment, Noordwijk, Netherlands, 6/16/03.
Minton TK, Garton DJ, Troya D, Maiti B, Pascual R, Schatz GC. Model atomic oxygen reactions: Detailed experimental and theoretical studies of the reactions of ground-state O(3P) with H2, CH4, CH3CH3, and CH3CH 2CH3 at hyperthermal collision energies. In European Space Agency, (Special Publication) ESA SP. 540 ed. 2003. p. 129-136
Minton, Timothy K. ; Garton, Donna J. ; Troya, Diego ; Maiti, Biswajit ; Pascual, Ronald ; Schatz, George C. / Model atomic oxygen reactions : Detailed experimental and theoretical studies of the reactions of ground-state O(3P) with H2, CH4, CH3CH3, and CH3CH 2CH3 at hyperthermal collision energies. European Space Agency, (Special Publication) ESA SP. 540. ed. 2003. pp. 129-136
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