ION-MOLECULAR REACTIONS IN GASEOUS-PHASE STUDIED IN THE GROUPS OF PERIODICAL SYSTEM

The courses of ion-molecular reactions in gaseous phase and in solutio ns significantly differ. From the aspects of classical chemical concep tions, mechanisms of these reactions in gaseous phase are unusual. Thi s bas been demonstrated for the reactions of hydrogen halides (HX, X = F, Cl, ...At) with their radical cations (HX.+) and for the reactions of methyl halides with their radical cations (CH3X + CH3X.+). The cou rses of these processes were investigated by the methods of quantum ch emistry; experimental data are at disposal in literature for some of t he processes.