Hostname: page-component-586b7cd67f-vdxz6 Total loading time: 0 Render date: 2024-11-20T09:25:14.606Z Has data issue: false hasContentIssue false

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
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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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
Copyright
© The Author(s) 2013

References

Références

Andersson, S., & van Dishoeck, E.F., 2008, A&A, 491 , 907
Bonev, B.P., Mumma, M.J., Villanueva, G.L., et al., 2007, ApJ, 661 , L97 CrossRef
Bockelée-Morvan, D., Woodward, C.E., Kelley, M.S., & Wooden, D.H., 2009, ApJ, 696 , 1075 CrossRef
Buntkowsky, G., Limbach, H.H., Walaszek, B., et al., 2008, Z. Phys. Chem.-Int. JRPCCP, 222 , 1049 CrossRef
Cacciani, P., Cosleou, J., & Khelkhal, M., 2012, PRA, accepted
Chehrouri, M., Fillion, J.H., Chaabouni, H., et al., 2011, PCCP, 13 , 2172 CrossRef
Crovisier, J., 2006, Mol. Phys., 104 , 2737 CrossRef
Fayolle, E.C., Bertin, M., Romanzin, C., et al., 2011, ApJ, 739 , L36 CrossRef
Hama, T., Watanabe, N., Kouchi, A., & Yokoyama, M., 2011, ApJ, 738 , L15 CrossRef
Hogerheijde, M.R., Bergin, E.A., Brinch, C., et al., 2011, Science, 334 , 338 CrossRef
Honvault, P., Jorfi, M., Gonzalez-Lezana, T., Faure, A., & Pagani, L., 2011, PRL, 107 , 023201 CrossRef
Kawakita, H., Dello Russo, N., Furusho, R., et al., 2006, ApJ, 643 , 1337 CrossRef
Lekic, A., 2011, Ph.D. Thesis, Univ Pierre & Marie Curie, France
Lis, D.C., Phillips, T.G., Goldsmith, P.F., et al., 2010, 65 coauthors, A&A, 521 , L26 Google Scholar
Manca, T., Quack, M., & Schmidiger, , 2011, Faraday Discuss., 150 , 120
Pachucki, K., & Komasa, J., 2008, PRA, 77 , 030501 CrossRef
Pagani, L., Roueff, E., & Lesaffre, P., 2011, ApJ, 739 , L35 CrossRef
Pardanaud, C., 2007, Ph.D. Thesis, Univ Pierre & Marie Curie, France
Scott, P.L., & Jeffries, C.D., 1962, PR, 127 , 32 CrossRef
Shinnaka, Y., Kawakita, H., Kobayashi, H., et al., 2011, ApJ, 729 , 81 CrossRef
Sliter, R., Gish, M., & Vilesov, A.F., 2011, JPCA, 115 , 9682 CrossRef
Sugimoto, T., & Fukutani, K., 2011, Nat. Phys., 7 , 307 CrossRef
Tudorie, M., Cacciani, P., Cosleou, J., et al., 2006, A&A, 453 , 755