Interaction between the ion dipole and the ionhyphen;induced dipole in reactions of the polar ion ArH+3

摘要

The reactions of the highly polar ion ArH+3with the nonpolar neutrals Xe, Kr, CH4, CO, NO, O2, and N2and with the polar neutrals SO2, H2O, NH3, CH3I, and C2H5I have been investigated in a selected ion flow drift tube experiment at near thermal conditions. The rate coefficients obtained have typically 15percnt;ndash;35percnt; larger values than the collisional limiting valueskLandkADOobtained by the Langevin and ADO (average dipole orientation) theory, respectively. These data are explained on the basis of the interaction between the dipole of ArH+3and the ionhyphen;induced dipole and the permanent dipole, respectively, of the neutral reactants. Rate coefficients for the reactions of H+3with the above neutrals were also obtained for comparison, as well as the zero field mobility of ArH+3in helium being (18.5plusmn;1.5) cm2/Vthinsp;s. The ion KrD+3(KrH+3) was detected unambiguously for the first time. Its dissociation energy is larger than 0.29 eV which is the lower limit of the dissociation energy of ArH+3.