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Implications of Ice Morphology for Comet Formation

Published online by Cambridge University Press:  30 March 2016

M. P. Collings ,
J. W. Dever ,
M. R. S. McCoustra  and
H. J. Fraser
M. P. Collings
Affiliation:
School of Chemistry, University of Nottingham, University Park, Nottingham, U.K., NG7 2RD.
J. W. Dever
Affiliation:
School of Chemistry, University of Nottingham, University Park, Nottingham, U.K., NG7 2RD.
M. R. S. McCoustra
Affiliation:
School of Chemistry, University of Nottingham, University Park, Nottingham, U.K., NG7 2RD.
H. J. Fraser
Affiliation:
Raymond and Beverly Sackler Laboratory of Astrophysics, Leiden Observatory, University of Leiden, Niels Bohr Weg 2, 2300 RA, Leiden, Netherlands

Abstract

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Laboratory surface science under ultra-high vacuum (UHV) conditions allows us to simulate the growth of ices in astrophysical environments. Using the techniques of temperature programmed desorption (TPD), reflection-absorption infrared spectroscopy (RAIRS) and micro-balance methods, we have studied binary ice systems consisting of water (H2O) and variety of other species including carbon monoxide (CO), at astrophysically relevant conditions of temperature and pressure. We present results that demonstrate that the morphology of water ice has an important influence on the behavior of such systems, by allowing processes such as diffusion and trapping that can not be understood through a knowledge of the binding energies of the species alone. Through an understanding of the implications of water ice morphology on the behavior of ice mixtures in the interstellar environment, additional constraints can be placed on the thermodynamic conditions and ice compositions during comet formation.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 491 - 494
Copyright
Copyright © Astronomical Society of Pacific 2005

References

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