A new flowing afterglow-guided ion beam tandem mass spectrometer. Applications to the thermochemistry of polyiodide ions

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Abstract

A new flowing afterglow-guided ion beam tandem mass spectrometer has been constructed. The tandem mass spectrometer has a linear quadrupole-octopole-quadrupole geometry. The apparatus has been successfully tested for the measurement of reaction rates and endothermic reaction thresholds. The new instrument has been used to determine 0 K bond strengths in two polyiodide ions: D(I2−I)=126±6 kJ/mol and D(I2−I 3 )=49±6 kJ/mol. These values compare well to recent computational results. Electron affinity (EA)(I3)=4.15±0.12 eV can be derived from this work and values in the literature.