Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..356..223p&link_type=abstract
Revealing the Molecular Universe: One Antenna is Never Enough ASP Conference Series, Vol. 356, Proceedings of the Conference Hel
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The tendency for deuterium to be concentrated into the cold dense regions of the galaxy is due to the lower ground state energy of the heavier molecules. Such chemical fractionation leads to [D/H] values as high as 1! In turn this allows the detection of species such as ND3, H2D+ and D2H+. The fraction of the interstellar medium (ISM) with such large deuteration is hard to estimate, but may be sufficient to cause both spatially variable and generally low [D/H] values in the diffuse ISM.
Lis Darek C.
Phillips Thomas G.
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