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Changes in the morphology of interstellar ice analogues afterhydrogen 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 stillremains poorly known. The experimental study described in this work focuses on howrelevant changes of the ice morphology result from atomic hydrogen exposure and subsequentrecombination. We show that there is an exponential decrease in the porosity of theamorphous water ice sample following hydrogen-atom irradiation. These and other laboratoryresults lead us to suggest that water ice in space is almost certainly amorphous andnon-porous (compact).

References

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