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Nanoscale structure of amorphous solid water: What determines the porosity in ASW?

Published online by Cambridge University Press:  12 October 2020

Sabrina Gärtner*
Affiliation:
School of Physical Sciences, The Open University, Walton Hall, Milton KeynesMK7 6AA, UK ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, DidcotOX11 0QX, UK
Thomas F. Headen
Affiliation:
ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, DidcotOX11 0QX, UK
Tristan G. A. Youngs
Affiliation:
ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, DidcotOX11 0QX, UK
Catherine R. Hill
Affiliation:
School of Physical Sciences, The Open University, Walton Hall, Milton KeynesMK7 6AA, UK
Natalia Pascual
Affiliation:
School of Physical Sciences, The Open University, Walton Hall, Milton KeynesMK7 6AA, UK
Olivier Auriacombe
Affiliation:
School of Physical Sciences, The Open University, Walton Hall, Milton KeynesMK7 6AA, UK RAL Space, STFC Rutherford Appleton Laboratory, Harwell Oxford, DidcotOX11 0QX, UK
Sergio Ioppolo
Affiliation:
School of Physical Sciences, The Open University, Walton Hall, Milton KeynesMK7 6AA, UK School of Electronic Engineering and Computer Science, Queen Mary University of London, Mile End Road, LondonE1 4FZ, UK
Thomas Loerting
Affiliation:
Institute of Physical Chemistry, University of Innsbruck, Innrain 52, 6020Innsbruck, Austria
Daniel T. Bowron
Affiliation:
ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, DidcotOX11 0QX, UK
Helen J. Fraser*
Affiliation:
School of Physical Sciences, The Open University, Walton Hall, Milton KeynesMK7 6AA, UK
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Abstract

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The pore structure of vapour deposited ASW is poorly understood, despite its importance to fundamental processes such as grain chemistry, cooling of star forming regions, and planet formation. We studied structural changes of vapour deposited D2O on intra-molecular to 30 nm length scales at temperatures ranging from 18 to 180 K and observed enhanced mobility from 100 to 150 K. An Arrhenius type model describes the loss of surface area and porosity with a common set of kinetic parameters. The low activation energy (428 K) is commensurate with van der Waals forces between nm-scale substructures in the ice. Our findings imply that water porosity will always change with time, even at low temperatures.

Type
Contributed Papers
Copyright
© International Astronomical Union 2020

References

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