Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...682l..69y&link_type=abstract
The Astrophysical Journal, Volume 682, Issue 1, pp. L69-L72.
Astronomy and Astrophysics
Astronomy
15
Ism: Dust, Extinction, Ism: Molecules, Molecular Data, Molecular Processes, Ultraviolet: Ism
Scientific paper
We demonstrate experimentally that photodissociation of amorphous solid water at 100 K results in formation of H2 molecules with an ortho/para ratio of gOPR=3. Two distinct mechanisms can be identified: endothermic abstraction of a hydrogen atom from H2O by a photolytically produced H atom yields vibrationally cold H2 products, whereas exothermic recombination of two H-atom photoproducts yields translationally and internally hot H2. These results are in accord with predictions by molecular dynamics calculations and their astrophysical implications are discussed.
Ashfold Michael N. R.
Hama Tetsuya
Iida Daisuke
Kawanaka Noboru
Kawasaki Masahiro
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