Abstract
The multiphoton ionization of the hydrogen-bonding cluster pyridazine–methanol (C 4H 4N 2–CH 3OH) was studied using a time-of-flight mass spectrometer at the wavelengths of 355 and 532 nm. At both wavelengths, a series of protonated C 4H 4N 2–(CH 3OH) n –H + cluster ions were obtained. Relevant ab initio calculations were performed with HF and B3LYP methods. Equilibrium geometries of both neutral and ionic C 4H 4N 2–CH 3OH clusters, and dissociation channels and dissociation energies of ionic clusters, are presented. The results show that when C 4H 4N 2–CH 3OH is vertically ionized, C 4H 4N 2H + and CH 3O are the dominant products via proton transfer reaction. A high energy barrier makes another channel corresponding to the production of C 4H 4N 2H + and CH 2OH disfavored.
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