Laboratory observation of the valence anion of cyanoacetylene, a possible precursor for negative ions in space

Daniel J. Goebbert, Dmitry Khuseynov, Andrei Sanov

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Valence anions of cyanoacetylene, HCCCN-, are synthesized by the 1,2 -H2+ abstraction reaction of O- with acrylonitrile, H2 C=CHCN, while the competing 1,1 -H2+ channel of the same reaction yields the cyanovinylidene anions, CCHCN-. The key to the formation of the elusive, adiabatically weakly bound HCCCN- is the bent -̇C = ̇C-Cskeleton of the reactant. The photoelectron spectrum of HCCCN -, measured by means of photoelectron imaging at 532 nm, consists of a broad structureless band with a vertical detachment energy of 1.04±0.05 eV. The observed anions are stable counterparts of the low-lying anionic resonances of cyanoacetylene, which may contribute (by way of dissociative attachment) to the formation of carbon-rich and CN-containing negative ions in extraterrestrial environments.

Original languageEnglish (US)
Article number161102
JournalJournal of Chemical Physics
Volume131
Issue number16
DOIs
StatePublished - Dec 21 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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