A proposed chemical scheme for HCCO formation in cold dense clouds

摘要: The ketenyl radical (HCCO) has recently been discovered in two cold dense clouds with a non-negligible abundance of few 10-11 (compared to H2). Until now, no chemical network able reproduce this observation. We propose here scheme that can HCCO abundances together HCO, H2CCO and CH3CHO the dark Lupus-1A L486. main formation pathway for is OH + CCH → H reaction as suggested by Agundez et al. but much larger rate coefficient than used current models. Since never studied experimentally or theoretically, value based on comparison other similar systems.