Tandem-Mass-Spectrometer Study of Solvated Derivatives of OD−. Total Hydration Energy of the Proton

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Abstract
Heats of hydration of OD− have been determined by measuring thresholds for collision‐induced dissociation reactions of hydrated OD− ions. These data showed similar values of hydrogen bonding energy for OD− and D3O+. Attenuation cross section for various solvated OD− ions were also measured and compared with D3O+ and its solvated derivatives. The relative sizes of solvated hydroxyl and hydrogen ions were found to be within 4% of each other for the unsolvated, mono‐, di‐, and trisolvated species. The very strong similarity in both ion size and hydrogen bonding energy of the respective positive and negative gaseous ions in the water system was used to divide the sum of the solvation energies of gaseous ions D9O4+ and D7O4−, and thus derive a value of 12.0 ± 0.3 eV for the heat of solution of the proton.