Formation of formaldehyde and carbon dioxide on an ICY grain analog using fast hydrogen atoms

S. M. Madzunkov, J. A. MacAskill, A. Chutjian, P. Ehrenfreund, M. R. Darrach, Gianfranco Vidali, B. J. Shortt

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Formaldehyde (H2CO) and carbon dioxide (CO2) were produced in collisions of a superthermal, 3 eV beam of H(2S) atoms with CO molecules adsorbed on a gold surface at 4.8 K. The reaction-generated products were detected and analyzed using the techniques of temperature programmed desorption (TPD), quadrupole mass spectrometry, and a novel application of the Metropolis algorithm, random-walk procedure to identify the unique fractionation patterns of H2CO and CO2 from the patterns of other species such as N2, CO, and H2O embedded in the CO blanket and devolved in the TPD/mass spectrometry process. Reaction sequences are given to account for the formation of H2CO and CO 2.

Original languageEnglish (US)
Pages (from-to)801-806
Number of pages6
JournalAstrophysical Journal
Volume697
Issue number1
DOIs
StatePublished - 2009

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Keywords

  • Circumstellar matter
  • ISM: molecules
  • Stars: winds, outflows
  • Words: astrochemistry

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Madzunkov, S. M., MacAskill, J. A., Chutjian, A., Ehrenfreund, P., Darrach, M. R., Vidali, G., & Shortt, B. J. (2009). Formation of formaldehyde and carbon dioxide on an ICY grain analog using fast hydrogen atoms. Astrophysical Journal, 697(1), 801-806. https://doi.org/10.1088/0004-637X/697/1/801