Photoreactions of Small Organic Molecules VII Photoionization Studies on the Ion‐Pair Formation of the Fluorochloromethanes CF2Cl2, CF3Cl, and CFCl3

Ion‐pair processes were studied applying photoionization mass spectroscopy in the photon energy range 8 — 30 eV. The investigation of the fluorochloromethanes CF2Cl2, CF3Cl, and CFCl3 revealed that the fragments F−, CF−, Cl−, CCl−, CF−2, FCl−, CFCl−, Cl−2, CF−3, CF2Cl−, and CFCl−2 are formed in unimolecular reactions. The Cl−‐yield of CFCl3 is strongly influenced by the attachment of photoelectrons. The ion efficiency curves of the halides show that a variety of ion‐pair processes leads to the formation of F− and Cl−. The interpretation has been confirmed by the corresponding efficiency curves of the positive ions.