Ion-molecule calculation of the abundance ratio of CCD to CCH in dense interstellar clouds

摘要: Laboratory measurements and calculations have been performed to determine the abundance ratio of deuterated ethynyl radical (CCD) normal (CCH) which can be achieved in dense interstellar clouds via isotopic fractionation C/sub 2/H/sub 2/(+) (HD)=C/sub 2/HD(+)(H/sub 2/) system reactions. According this limited treatment, CCD/CCH attained is range 0.02-0.03 for Orion molecular cloud 0.0l-0.02 TMC-1. These ranges numbers are reasonable agreement with observed values However, analysis complicated presence competing mechanisms, especially low-temperature source 28 references.