Abstraction reactions of Ca+ and Sr+ ions

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Abstract
The endothermic reactions Ca+ (O2, O) CaO+, Ca+ (CO2, CO) CaO+, Ca+(H2O, H) CaOH+, Sr+ (O2, O)SrO+, and Sr+ (H2O, H) SrOH+ have been studied in a tandem mass spectrometer. The measured thresholds yield D00(Ca+–O)=3.30±0.1 eV, D00 (Ca+–OH)=4.51±0.15 eV, D00(Sr+–O)=3.07±0.15 eV, and D00(Sr+–OH)=4.57±0.1 eV. These dissociation energies lead to I.P.(CaO)=6.9±0.15 eV, I.P. (SrO)=7.0±15 eV, I.P.(CaOH)=5.6±0.2 eV, and I.P.(SrOH)=5.1±0.2 eV, when combined with auxiliary thermodynamic data. These ionization potentials agree with previous measurements, except for I.P. (CaO) which is considerably lower. This discrepancy is briefly discussed.