Réactions ion/molécule de l'ion C2H3Cl+ dans le mélange gazeux: chlorure de vinyle – chlorure d'éthyle

Abstract

Ion/molecule reactions of C2H3Cl+ have been studied in a mixture of vinyl and ethyl chlorides. The ionic processes have been followed using two mass spectrometers; one is based on the ionic cyclotronic resonance (ICR) while the other is based on photo-ionization at high pressure. The results obtained on these two instruments are complementary and they indicate that the ion C2H3Cl+ does not react directly with ethyl chloride. However, the ions C4H3Cl+ and C4H6Cl+, which are formed following the decomposition of the excited ion-dimer of vinyl chloride, do react with ethyl chloride in a series of condensation reactions involving in each step an elimination of HCl or of Cl. In a mixture of the two chlorides, the most important ions are the C8H13+ and C8H14+; at a pressure of 1 Tonr, their total intensity is equal to 50%. Keywords: ion/molecule reactions of C2H3Cl+, vinyl and ethyl chloride mixtures, mass spectrometry. [Journal translation]