Isotope Effects in the Reaction of H^+(H_2O)_2/D^+(D_2O)_2 with Acetone/Dimethylsulfoxide

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We investigated isotope effects in the reactions of protonated water dimer ions H+(H2O)2/D+(D2O)2 with acetone and dimethylsulfoxide (DMSO) using a guided ion beam apparatus. The reaction cross section, σr, of H+(H2O)2 with acetone was found to be slightly larger than that of D+(D2O)2 at low collision energies, <0.5 eV, where the ratio of the σr, was less than 1.5. The σr of H+(H2O)2 with DMSO was approximately twice as large as that of D+(D2O)2 with DMSO. Major reaction products were Y+X, where Y=H, D and X=acetone, DMSO. We examine two possible reaction processes, the proton transfer reaction via intermediate compounds and direct proton transfer.
日本質量分析学会の論文
2005-12-01