Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.6507f&link_type=abstract
American Astronomical Society, DPS meeting #41, #65.07
Astronomy and Astrophysics
Astrophysics
Scientific paper
The physical state of water ice at low temperatures is a subject of continuing research and debate. Particularly in astrophysics, the phases of water ice are an important indicator of the state, history and evolution of the icy astrophysical surfaces such as those found in the outer solar system (e.g., icy satellites and planetary surfaces, rings, trans-Neptunian objects), comets, or in the interstellar clouds. When deposited from the vapor phase, and depending on the substrate temperature, water ice can be found crystalline (hexagonal or cubic) or amorphous.
In this work, we address the question of how the deposition rate (several orders of magnitude different between laboratory conditions and real astrophysical surfaces), the presence of contaminants (a likely scenario for astrophysical bodies) and the constantly exposure to radiation environments can affect the final state for the water ice phases.We also present a detailed study of the isothermal crystallization of thick ASW ice films grown at 100 K. These films are thick enough to ensure that the crystallization rate remains independent of substrate and influenced/initiated by surface nucleation. The phase transformation is studied as a function of annealing temperature and is monitored via infrared spectroscopy over a range of temperatures (130 - 140 K). Determination of the extent of crystalline during annealing is determined via the de-convolution of the partially crystallized infrared spectrum into amorphous and crystalline components. The present measurements aim to resolve some anomalies in the literature regarding the crystallization mechanism of ASW.
Baragiola Raúl A.
Burke Daniel
Fama Marcelo A.
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