Thermal desorption characteristics of CO, O 2 and CO 2 on non-porous water, crystalline water and silicate surfaces at submonolayer and multilayer coverages

J. A. Noble, E. Congiu, F. Dulieu, H. J. Fraser

Research output: Contribution to journalArticlepeer-review

128 Scopus citations

Abstract

The desorption characteristics of molecules on interstellar dust grains are important for modelling the behaviour of molecules in icy mantles and, critically, in describing the solid-gas interface. In this study, a series of laboratory experiments exploring the desorption of three small molecules from three astrophysically relevant surfaces is presented. The desorption of CO, O 2 and CO 2 at both submonolayer and multilayer coverages was investigated from non-porous water, crystalline water and silicate surfaces. Experimental data were modelled using the Polanyi-Wigner equation to produce a mathematical description of the desorption of each molecular species from each type of surface, uniquely describing both the monolayer and multilayer desorption in a single combined model. The implications of desorption behaviour over astrophysically relevant time-scales are discussed.

Original languageEnglish
Pages (from-to)768-779
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume421
Issue number1
DOIs
StatePublished - Mar 2012
Externally publishedYes

Keywords

  • Astrochemistry
  • ISM: molecules
  • Methods: laboratory

Fingerprint

Dive into the research topics of 'Thermal desorption characteristics of CO, O 2 and CO 2 on non-porous water, crystalline water and silicate surfaces at submonolayer and multilayer coverages'. Together they form a unique fingerprint.

Cite this