Proton Affinities of H2S and H2O

Abstract

Ion cyclotron single‐ and multiple‐resonance spectroscopy have been used to identify and examine the energetics of ion‐molecule reactions in which H₃O⁺ and H₃S⁺ are involved either as product or reactant. The reactions observed provide narrow limits for the gas‐phase proton affinities of these species, giving 164 ± 4 kcal/mole for H₂O and 178 ± 2 kcal/mole for H₂S.