Nanoscale structure of amorphous solid water: What determines the porosity in ASW?. Issue Volume 15:Issue S350(2019) (April 2019)

• Record Type: Journal Article
• Authors: Gärtner, Sabrina; Headen, Thomas F.; Youngs, Tristan G. A.; Hill, Catherine R.; Pascual, Natalia; Auriacombe, Olivier; Ioppolo, Sergio; Loerting, Thomas; Bowron, Daniel T.; Fraser, Helen J.
• Editors: Salama, Farid; Linnartz, Harold
• Is Part Of: Proceedings of the International Astronomical Union. Volume 15:Issue S350(2019)
• Page Start: 368
• Page End: 369
• Publication Date: 2019-04
• Subjects: astrochemistry, -- methods: laboratory, -- planets and satellites: formation, -- comets: general, -- solar system: formation, -- ISM: kinematics and dynamics, -- ISM: evolution, -- dense matter; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921319008275
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: 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 D2 O 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.