Possible interstellar anions: CnS− and CnO− (n = 2–8) Original Research Article

The geometries, electron affinities and/or electron detachment energies for the CnS and CnO (n = 2–8) molecules and their anions were calculated by using the RCCSD (T) method. The CnS− (even n = 4, 6, and 8) and CnO− (even n = 6 and 8) anions are found to be substantially more stable than their corresponding neutral species. Several anions are potentially detectable as interstellar molecules.