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Understanding the relationship between gas and ice : experimental investigations on ortho-para ratios

Published online by Cambridge University Press:  13 February 2013

J.-H. Fillion ,
M. Bertin ,
A. Lekic ,
A. Moudens ,
L. Philippe  and
X. Michaut
J.-H. Fillion
Affiliation:
UPMC Université Paris 06, UMR 7092, LPMAA, 75005 Paris, France CNRS, UMR 7092, LPMAA, 75005 Paris, France
M. Bertin
Affiliation:
UPMC Université Paris 06, UMR 7092, LPMAA, 75005 Paris, France CNRS, UMR 7092, LPMAA, 75005 Paris, France
A. Lekic
Affiliation:
UPMC Université Paris 06, UMR 7092, LPMAA, 75005 Paris, France CNRS, UMR 7092, LPMAA, 75005 Paris, France
A. Moudens
Affiliation:
UPMC Université Paris 06, UMR 7092, LPMAA, 75005 Paris, France CNRS, UMR 7092, LPMAA, 75005 Paris, France
L. Philippe
Affiliation:
UPMC Université Paris 06, UMR 7092, LPMAA, 75005 Paris, France CNRS, UMR 7092, LPMAA, 75005 Paris, France
X. Michaut
Affiliation:
UPMC Université Paris 06, UMR 7092, LPMAA, 75005 Paris, France CNRS, UMR 7092, LPMAA, 75005 Paris, France

Abstract

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Numerous hydrogenated molecules observed in comets and the interstellar medium present nuclear spin isomers. The non-thermal ortho: para ratios measured in space are believed to be of high diagnostic value, allowing remote measurement of physical conditions prevailing in the past, such as the initial temperature associated with a molecular formation or condensation. The lack of laboratory studies on interactions at the gas-solid interface limits our current interpretation of observations. Recent progress in nuclear spin conversion (NSC) dynamics are discussed in this paper. Results on water and methane in cryogenic matrices illustrate the conversion mechanisms within the condensed phase at very low temperatures. NSC of molecular hydrogen at the surface of 10 K Amorphous Solid Water (ASW) shows surface mediated conversion processes for molecular hydrogen. NSC involving molecular ices are discussed in the light of few recent studies, including UV photodesorption investigations.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 58: ECLA - European Conference on Laboratory Astrophysics , 2012 , pp. 307 - 314
Copyright
© The Author(s) 2013

References

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