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Changes in the morphology of interstellar ice analogues after hydrogen atom exposure

Published online by Cambridge University Press:  13 February 2013

E. Congiu ,
M. Accolla ,
F. Dulieu ,
H. Chaabouni ,
J.-L. Lemaire ,
H. Mokrane ,
E. Matar ,
G. Manicò  and
V. Pirronello
E. Congiu
Affiliation:
LERMA-LAMAp, UMR 8112 du CNRS, Observatoire de Paris et Université de Cergy-Pontoise, 5 mail Gay-Lussac, 95000 Cergy Pontoise Cedex, France;. e-mail: econgiu@u-cergy.fr
M. Accolla
Affiliation:
LERMA-LAMAp, UMR 8112 du CNRS, Observatoire de Paris et Université de Cergy-Pontoise, 5 mail Gay-Lussac, 95000 Cergy Pontoise Cedex, France;. e-mail: econgiu@u-cergy.fr DMFCI, Università di Catania, Viale Doria 6, 95125 Catania, Italy
F. Dulieu
Affiliation:
LERMA-LAMAp, UMR 8112 du CNRS, Observatoire de Paris et Université de Cergy-Pontoise, 5 mail Gay-Lussac, 95000 Cergy Pontoise Cedex, France;. e-mail: econgiu@u-cergy.fr
H. Chaabouni
Affiliation:
LERMA-LAMAp, UMR 8112 du CNRS, Observatoire de Paris et Université de Cergy-Pontoise, 5 mail Gay-Lussac, 95000 Cergy Pontoise Cedex, France;. e-mail: econgiu@u-cergy.fr
J.-L. Lemaire
Affiliation:
LERMA-LAMAp, UMR 8112 du CNRS, Observatoire de Paris et Université de Cergy-Pontoise, 5 mail Gay-Lussac, 95000 Cergy Pontoise Cedex, France;. e-mail: econgiu@u-cergy.fr
H. Mokrane
Affiliation:
LERMA-LAMAp, UMR 8112 du CNRS, Observatoire de Paris et Université de Cergy-Pontoise, 5 mail Gay-Lussac, 95000 Cergy Pontoise Cedex, France;. e-mail: econgiu@u-cergy.fr
E. Matar
Affiliation:
LERMA-LAMAp, UMR 8112 du CNRS, Observatoire de Paris et Université de Cergy-Pontoise, 5 mail Gay-Lussac, 95000 Cergy Pontoise Cedex, France;. e-mail: econgiu@u-cergy.fr
G. Manicò
Affiliation:
DMFCI, Università di Catania, Viale Doria 6, 95125 Catania, Italy
V. Pirronello
Affiliation:
DMFCI, Università di Catania, Viale Doria 6, 95125 Catania, Italy

Abstract

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Interstellar water ice is mainly amorphous, but the nature of its morphology still remains poorly known. The experimental study described in this work focuses on how relevant changes of the ice morphology result from atomic hydrogen exposure and subsequent recombination. We show that there is an exponential decrease in the porosity of the amorphous water ice sample following hydrogen-atom irradiation. These and other laboratory results lead us to suggest that water ice in space is almost certainly amorphous and non-porous (compact).

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 58: ECLA - European Conference on Laboratory Astrophysics , 2012 , pp. 357 - 360
Copyright
© The Author(s) 2013

References

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