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UV photodesorption of interstellar CO ice analogues: from subsurface excitation to surface desorption

Physical chemistry chemical physics : PCCP, 2012-07, Vol.14 (28), p.9929-9935 [Peer Reviewed Journal]

Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 1463-9076 ;EISSN: 1463-9084 ;DOI: 10.1039/C2CP41177F

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  • Title:
    UV photodesorption of interstellar CO ice analogues: from subsurface excitation to surface desorption
  • Author: Bertin, Mathieu ; Fayolle, Edith C. ; Romanzin, Claire ; Öberg, Karin I. ; Michaut, Xavier ; Moudens, Audrey ; Philippe, Laurent ; Jeseck, Pascal ; Linnartz, Harold ; Fillion, Jean-Hugues
  • Subjects: Astrophysics ; Chemical Physics ; Galactic Astrophysics ; Physics ; Space Physics
  • Is Part Of: Physical chemistry chemical physics : PCCP, 2012-07, Vol.14 (28), p.9929-9935
  • Description: Carbon monoxide is after H 2 the most abundant molecule identified in the interstellar medium (ISM), and is used as a major tracer for the gas phase physical conditions. Accreted at the surface of water-rich icy grains, CO is considered as the starting point of a complex organic – presumably prebiotic – chemistry. Non-thermal desorption processes, and especially photodesorption by UV photons, are seen as the main cause that drives the gas-to-ice CO balance in the colder parts of the ISM. The process is known to be efficient and 10 wavelength-dependent, but, the underlying mechanism and the physical-chemical parameters governing the photodesorption are still largely unknown. Using monochromatized photons from a synchrotron beamline, we reveal that the molecular mechanism responsible for CO photoejection is an indirect, (sub)surface-located process. The local environment of the molecules plays a key role in the photodesorption efficiency, and is quenched by at least an order of magnitude for CO interacting with a water ice surface.
  • Publisher: Royal Society of Chemistry
  • Language: English
  • Identifier: ISSN: 1463-9076
    EISSN: 1463-9084
    DOI: 10.1039/C2CP41177F
  • Source: Hyper Article en Ligne (HAL) (Open Access)
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