Collision-Induced Photon Emissions from 8 keV Polyatomic Ions of Composition C 2,H 4,O +• and C 2,H 5,Cl +•

Photon emissions following 8 keV ion beam–target gas collisions of the polyatomic cations of composition C₂,H₄,O^+• and C₂,H₅,Cl^+• were measured and interpreted in conjunction with their collision-induced dissociation (CID) mass spectra. The experiments were performed in a modified analytical VG ZAB-2F mass spectrometer of magnetic sector/electric sector/electric sector (BEE) geometry. The identification of the emission bands in the collision-induced emission (CIE) spectra of oxirane^+•, acetaldehyde^+• and vinyl alcohol^+• with helium and argon target gases was assisted by obtaining the CIE spectra of CO^+•, HCO⁺ and CH₃₊. Distinct emission bands due to the HC (A,B → X), HC⁺ (B → A and A → X) and HO^• (A → X) transitions, as well as atomic C, O⁺ and H^• lines, were observed. The emission spectra of 8 keV CH₃CH₂Cl^+• and CH₃ClCH₂^+•–helium and argon target gas collisions were obtained and analyzed with the aid of the CIE spectra for CCl⁺ and CH₂Cl⁺. Many of the same bands appeared as for the C₂,H₄,O^+• isomers, with the addition of bands due to the CCl⁺ (A → X) transition and Cl⁺ atomic lines.