Laboratory synthesis of molecular hydrogen on surfaces of astrophysical interest

V. Pirronello, Chi Liu, Liyong Shen, Gianfranco Vidali

Research output: Contribution to journalArticlepeer-review

156 Scopus citations


We report on the first results of experiments to measure the recombination rate of hydrogen on surfaces of astrophysical interest. Our measurements give lower values for the recombination efficiency (sticking probability S times the probability of recombination upon H-H encounter, γ) than model-based estimates. We propose that our results can be reconciled with average estimates of the recombination rate [(1/2)nHngvH ASγ from astronomical observations, if the actual surface of an average grain is rougher, and its area bigger, than the one considered in models.

Original languageEnglish (US)
Pages (from-to)L69-L72
JournalAstrophysical Journal
Issue number1 PART II
StatePublished - 1997


  • Dust, extinction
  • ISM: abundances
  • ISM: molecules
  • Molecular processes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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