Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..479p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 479-488.
Astronomy and Astrophysics
Astrophysics
26
Deuterium Compounds, Gas-Ion Interactions, Hydrogen Compounds, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Molecular Ions, Abundance, Positive Ions, Steady State, Thermodynamic Equilibrium, Vapor Phases
Scientific paper
A simple gas-phase, steady-state chemical model of H2D(+) is presented where the ortho/para ratio is investigated in detail. We show that thermal equilibrium should prevail above 20 K but that it is in cold clouds that the ortho form should be the most abundant contrarily to what is expected from thermal equilibrium alone, its abundance being several orders of magnitude larger than previously thought, in which case, cold clouds with high column densities should be the best places to search for this species. We discuss the upper limits derived from our observations (Pagani et al., 1992) in comparison with our model and also reexamine the relations between H2D(+) measurements, the DCO(+)/HCO(+) ratio and the abundances of H3(+), H2D(+), and of electrons in dark clouds. Recent findings in observational, theoretical and laboratory astrochemistry make it difficult to derive H3 and e(-) abundances from these measurements and thus make it difficult to derive the important H2D(+)/H3(+) ratio.
Pagani Laurent
Salez Morvan
Wannier Peter G.
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