%0 Journal Article
%T A proposed chemical scheme for HCCO formation in cold dense clouds
%A V. Wakelam
%A J. -C. Loison
%A K. M. Hickson
%A M. Ruaud
%J Physics
%D 2015
%I arXiv
%R 10.1093/mnrasl/slv097
%X The ketenyl radical (HCCO) has recently been discovered in two cold dense clouds with a non-negligible abundance of a few 1e-11 (compared to H2) (Agundez et al. 2015). Until now, no chemical network has been able to reproduce this observation. We propose here a chemical scheme that can reproduce HCCO abundances together with HCO, H2CCO and CH3CHO in the dark clouds Lupus-1A and L486. The main formation pathway for HCCO is the OH + CCH -> HCCO + H reaction as suggested by Agundez et al. (2015) but with a much larger rate coefficient than used in current models. Since this reaction has never been studied experimentally or theoretically, this larger value is based on a comparison with other similar systems.
%U http://arxiv.org/abs/1509.00336v1