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Related Experiment Videos

Controlling the morphology of amorphous solid water

Stevenson1, Kimmel, Dohnalek

  • 1Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Post Office Box 999, Mail Stop K8-88, Richland, WA 99352, USA.

Science (New York, N.Y.)
|March 5, 1999
PubMed
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The structure of amorphous solid water depends on how water molecules arrive during vapor deposition. Controlling the incident angle allows tuning its porosity, which is key for understanding its role in space.

Area of Science:

  • Materials Science
  • Astrophysics
  • Physical Chemistry

Background:

  • Amorphous solid water (ASW) is present in astrophysical environments.
  • Its physical and chemical properties are crucial for understanding interstellar processes.
  • Existing knowledge has limitations in explaining ASW's behavior in space.

Purpose of the Study:

  • To investigate the influence of water molecule incidence angle on ASW morphology.
  • To explore methods for controlling ASW properties in laboratory settings.
  • To provide insights into ASW's role in astrophysical environments.

Main Methods:

  • Vapor deposition of water molecules.
  • Systematic variation of the incident angle using a collimated beam.
  • Characterization of ASW morphology and porosity.

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Main Results:

  • ASW morphology is strongly dependent on the angular distribution of incident water molecules.
  • Controlled variation of incident angle leads to nonporous to highly porous ASW.
  • Demonstrated ability to control ASW structure via deposition parameters.

Conclusions:

  • The angle of water molecule incidence is a critical factor in ASW formation.
  • Laboratory control over ASW porosity can be achieved.
  • Findings may help resolve conflicts regarding ASW properties in astrophysical contexts.