Equilibration of nuclear spin states of CH_4 at low temperatures

Details Equilibration of nuclear spin states of CH_4 at low temperatures Equilibration of nuclear spin states of CH_4 at low temperatures

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..193l&link_type=abstract

SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in

Astronomy and Astrophysics

Astrophysics

Scientific paper

Hydrogenated molecules are observed in astrophysical cold media as interstellar media (ISM) or cometary atmospheres. In many cases, the relative populations of each nuclear spin configuration of these hydrogenated species diverge strongly from their value at thermal equilibrium in the gaseous phase. In order to understand the parameters ruling the nuclear spin states equilibration of these kind of molecules in astrophysical conditions, experimental studies are performed in cold media (solid and at gas-solid interface). We present the latest experimental results of NSC dynamics for methane trapped in argon matrix between 4.3 K and 20 K. Preliminary results concerning nuclear spin states equilibration in a cold closed cell are also presented.

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