| Abstract
| - The kinetic energy dependences of the reactions of Mo+ (6S) with ethane and propane have beenstudied using guided ion beam mass spectrometry. No exothermic reactions are observed in these systems,in contrast to results for the neighboring element, Nb+. At slightly elevated energies, dehydrogenation ofthe two hydrocarbons is observed as the dominant process at low energies in both reaction systems. Athigh energies, products resulting from both C−H and C−C cleavage processes are appreciable. Modelingof the endothermic reaction cross-sections yields the 0 K bond dissociation energies (in eV) of D0(Mo−H) = 2.06 ± 0.19, D0(Mo+−H2) = 0.14 ± 0.15, D0(Mo+−CH) = 5.32 ± 0.14, D0(Mo+−CH3) = 1.57± 0.09, D0(Mo+−C2H) = 3.25 ± 0.22, D0(Mo+−C2H2) ≥ 1.87 ± 0.05, D0(Mo+−C2H3) = 2.95 ± 0.15,D0(Mo+−C2H4) ≥ 0.82 ± 0.03, D0(Mo+−C2H5) = 2.09 ± 0.14, D0(Mo+−C3H2) = 4.34 ± 0.21,D0(Mo+−C3H4) = 2.22 ± 0.03, and D0(Mo+−C3H6) ≥ 0.81 ± 0.05. The ionization energy of MoH isalso derived as 7.43 ± 0.20 eV. The results for Mo+ are compared to those for the first-row transition-metal congener, Cr+, and the neighboring element, Nb+.
- The kinetic energy dependences of the reactions of Mo+ (6S) with ethane and propane have been studied using guided ion beam mass spectrometry. No exothermic reactions are observed in these systems, but at slightly elevated energies, dehydrogenation is observed as the dominant process in both reaction systems. Modeling of the endothermic reaction cross-sections yields the 0 K bond dissociation energies for a number of Mo+−CxHy species. Results for Mo+ are compared with those for the first-row transition-metal congener, Cr+, and the neighboring element, Nb+.
|
