Nuclear spin conversion of water in condensed phase: results and future developments for the understanding of the ortho/para ratios measured in space

Details Nuclear spin conversion of water in condensed phase: results and future developments for the understanding of the ortho/para ratios measured in space Nuclear spin conversion of water in condensed phase: results and future developments for the understanding of the ortho/para ratios measured in space

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe..55p&link_type=abstract

"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782

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Water and other molecules of astrophysical interest like H2, NH3, H2CO, or CH4 exist in different nuclear spin configurations. The population ratios between the nuclear spin species measured for different molecules in the environment of comets or in interstellar dark clouds are often far from the value expected for thermodynamically equilibrated populations. As it is possible that nuclear spin conversion (NSC) takes a very long time in space, these ratios could have kept the memory of the formation conditions of molecules, and specially of their formation temperature. In this context, we have investigated parameters involved in the NSC of water isolated in rare gas solids at low temperatures (between 4 and 30 K). We present here our recent results and the knowledge gained about the influence of magnetic interactions in the solid state at low temperatures. Finally, we point out the interest of developing new experiments to estimate the NSC times in water ices at low temperatures, for a better understanding of the nuclear spin state ratios measured in space.

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