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Peeling the astronomical onion.

Alexander Rosu-Finsen1, Demian Marchione1, Tara L Salter2

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This summary is machine-generated.

Water ice mobility on interstellar dust grains is surprisingly high at low temperatures. This leads to non-uniform ice coatings, exposing bare grain surfaces for other molecule formation.

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Area of Science:

  • Astrochemistry
  • Surface Science
  • Interstellar Medium

Background:

  • Water ice is abundant in interstellar space, playing a key role in star and planet formation.
  • Understanding water ice behavior on dust grains is crucial for astrochemistry.
  • Previous assumptions suggested limited water molecule mobility on cold dust grains.

Purpose of the Study:

  • To investigate the thermally-activated mobility of water (H2O) molecules on model interstellar grain surfaces.
  • To determine the activation energy for water molecule movement on relevant astrophysical surfaces.
  • To understand the implications for ice formation and surface chemistry in dense interstellar clouds.

Main Methods:

  • Reflection-absorption infrared spectroscopy (RAIRS) was used to study water ice.
  • Experiments were conducted on amorphous silica and highly oriented pyrolytic graphite surfaces.
  • Surface annealing was performed to observe changes in water ice mobility.

Main Results:

  • Strongly non-Arrhenius behavior was observed for water molecule mobility.
  • An activation energy of 2 kJ mol-1 was found on silica below 25 K.
  • An activation energy of 0 kJ mol-1 was found on both surfaces between 25 K and 100 K.

Conclusions:

  • Water ice mobility is significant even at low interstellar temperatures.
  • This mobility leads to aggregation and non-uniform ice coatings on dust grains.
  • Exposed bare grain surfaces facilitate the formation or adsorption of other molecules, impacting interstellar chemistry.