Collision-induced photon emissions from 8 keV polyatomic ions of composition C

₂,H₄,O^+" and C₂,H₅,Cl^+"

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Eur. J. Mass Spectrom. 1, 23 - 31 (1995)

Collision-induced photon emissions from 8 keV polyatomic ions of composition C₂,H₄,O^+" and C₂,H₅,Cl^+"

J.L. Holmes^* and P.M. Mayer
Chemistry Department, University of Ottawa, Ottawa, Canada K1N 6N5

ABSTRACT:

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.

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