Rapid neutral-neutral reactions at low temperatures: a new network and first results for TMC-1
Abstract
There is now ample evidence from an assortment of experiments, especially those involving the CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) technique, that a variety of neutral-neutral reactions possess no activation energy barrier and are quite rapid at very low temperatures. These reactions include both radical-radical systems and, more surprisingly, systems involving an atom or a radical and one `stable' species. Generalizing from the small but growing number of systems studied in the laboratory, we estimate reaction rate coefficients for a larger number of such reactions and include these estimates in a new network of gas-phase reactions for use in low-temperature interstellar chemistry. Designated osu.2003, the new network is available on the World Wide Web and will be continually updated. A table of new results for molecular abundances in the dark cloud TMC-1 (CP) is provided and compared with results from an older (new standard model; nsm) network.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 2004
- DOI:
- 10.1111/j.1365-2966.2004.07656.x
- Bibcode:
- 2004MNRAS.350..323S