Abstract
In this paper we report the results of a study on the dissociative recombination (DR) of the diacetylene cation, C 4D 2 +, which has been carried out at the ion storage ring CRYRING in Stockholm, Sweden. The energy-dependent absolute DR cross-section as well as the branching fractions at ∼0 eV collision energy were measured. The DR cross-section was best fitted using the expression σ( E) = (7.5 ± 1.5) × 10 −16 × E −(1.29±0.03) cm 2 over the collision energy range 1–100 meV. The thermal rate coefficient was deduced from the cross-section to be α( T) = (1.10 ± 0.15) × 10 −6 × ( T/300) −(0.79±0.03) cm 3/s. The reported branching fractions for C 4D 2 + agree with previous experiments on the DR of C 4H 2 + performed at the ASTRID storage ring in Aarhus, Denmark, and furthermore, indicate that the DR of C 4D 2 + possesses only two channels leading to the following products: C 4D + D (75%) and C 2D + C 2D (25%).
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