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ELECTRON CAPTURE NEGATIVE ION MASS SPECTRA OF SOME FREON DERIVATIVES

Nail L. Asfandiarov¹, Stanislav A. Pshenichnyuk¹, Vladimir S. Fal'ko¹, Jolanta Wnorowska², Karol Wnorowski², Iwona Szamrej-Foryś²

¹Institute of Physics of Molecules and Crystals, Russian Academy of Science, 151 October Pr., Ufa, 450075 Russia,
²Chemistry Department, University of Podlasie, 3 Maja Str. 54, 08-110 Siedlce, Poland

The temperature dependence of dissociative attachment has been investigated in the temperature range 350-575 K for two Freon derivatives 1,1,1-C₂H₃F₂Cl and C₂F₅Cl using Electron Capture Negative Ion Mass Spectra (ECNI MS). The temperature dependence for 1,1,1-C₂H₃F₂Cl is similar to that observed in the case of CF₃Cl reported by Illenberger et al. In contrast, C₂F₅Cl exhibits quite a different spectrum and its temperature behavior. It has been suggested that s*C-Cl delocalization onto two empty orbital leads to Cl^- ion formation in two different resonance states.