Abstract
Results obtained from the study of ionic reactions at the University of Rennes are reviewed. A brief description of the apparatus available in our laboratory is given. The historical evolution of the flowing afterglow device is emphasized as it is directly connected to one of the major puzzling questions in dissociative recombination studies: what is the rate coefficient for the dissociative recombination of H 3 + in its ground state? Special attention is given to the dissociative recombination process which until recently was the main topic studied in Rennes. A compilation of our measurements of branching ratios and rate coefficients is presented. Results from other authors are also outlined with particular attention paid to H 3 +. Electron attachment and ion/molecule reactions studied with the flowing afterglow Langmuir probe mass spectrometer are presented. The first results of ion/molecule reactions at very low temperatures have been recently obtained with the CRESU apparatus available in Rennes. Comparison with measurements carried out in Meudon at lower pressures is made and discussed.
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