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Electron attachment to NCCCCN, dicyanoacetylene (2-butynedinitrile), has been observed. Metastable parent anions, NCCCCN−*, with microsecond or longer lifetimes are formed close to 0 eV electron energy with a cross section of ≥0.25 A2. The stability of NCCCCN−* suggests that radiative attachment to NCCCCN and similar linear carbon chain molecules may be an important mechanism for the formation of negatively charged molecular ions in astrophysical environments. CCCN− and CN− fragment anions are formed at ~3 and ~6 eV.

Experimental Evidence for Radiative Attachment in Astrochemistry from Electron Attachment to NCCCCN