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>State selected ionndash;molecule reactions by a TESICO technique. III. H2+(v)+Arrarr;ArH++H, Ar++H2: Observation of enhanced chargehyphen;transfer cross sections at near resonance
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State selected ionndash;molecule reactions by a TESICO technique. III. H2+(v)+Arrarr;ArH++H, Ar++H2: Observation of enhanced chargehyphen;transfer cross sections at near resonance
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机译：State selected ionndash;molecule reactions by a TESICO technique. III. H2+(v)+Arrarr;ArH++H, Ar++H2: Observation of enhanced chargehyphen;transfer cross sections at near resonance
Reactions of the H2+ions with Ar, i.e., H2++Arrarr;ArH++H lsqb;proton transfer, Reaction (1)rsqb; and H2++Arrarr;Ar++H2lsqb;charge transfer, Reaction (2)rsqb; have been studied for the individual vibrational statesv(v= 0ndash;4) of the reactant ion at collision energies of 0.48, 0.77, and 1.24 eV, utilizing the threshold electronndash;secondary ion coincidence (TESICO) technique. At 0.77 and 1.24 eV, the cross sections for Reaction (1) are almost independent of the vibrational energy or slightly increase with increasing vibrational energy, wheras those for Reaction (2) show a resonancehyphen;like enhancement atv= 2 . At the lowest collision energy studied (0.48 eV), however, the enhancement of the charge transfer cross section atv= 2 is accompanied by a concurrent decrease in the proton transfer cross section, indicating the competitive nature of the two channels at this collision energy. These results are consistent with the trajectoryndash;surface hopping model of the ArH2+system by Chapman and Preston. Reaction (2) has also been studied at a higher collision energy of 19 eV, where the endoergic reaction withv= 1 is found to be considerably enhanced and has a cross section close to that for the nearhyphen;resonant reaction withv= 2.
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