Excitation and dissociation of tungsten hexacarbonyl W(CO)6: Statistical and nonstatistical dissociation processes - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The Journal of Chemical Physics Année : 2011

Excitation and dissociation of tungsten hexacarbonyl W(CO)6: Statistical and nonstatistical dissociation processes

Résumé

We have studied the excitation and dissociation processes of the molecule W(CO)6 in collisions with low kinetic energy (3 keV) protons, monocharged fluorine, and chlorine ions using double charge transfer spectroscopy. By analyzing the kinetic energy loss of the projectile anions, we measured the excitation energy distribution of the produced transient dications ${\rm W(CO)}_{\rm 6}{^{{\rm 2 + }}}$W( CO )62+. By coincidence measurements between the anions and the stable or fragments of ${\rm W(CO)}_{\rm 6}{^{{\rm 2 + }}}$W( CO )62+, we determined the energy distribution for each dissociation channel. Based on the experimental data, the emission of the first CO was tentatively attributed to a nonstatistical direct dissociation process and the emission of the second or more CO ligands was attributed to the statistical dissociation processes. The dissociation energies for the successive breaking of the W-CO bond were estimated using a cascade model. The ratio between charge separation and evaporation (by the loss of CO+ and CO, respectively) channels was estimated to be 6% in the case of Cl+ impact.
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Dates et versions

hal-04651848 , version 1 (17-07-2024)

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S. Martin, L. Chen, R. Brédy, Jérôme Bernard, G. Montagne, et al.. Excitation and dissociation of tungsten hexacarbonyl W(CO)6: Statistical and nonstatistical dissociation processes. The Journal of Chemical Physics, 2011, 134 (3), ⟨10.1063/1.3523347⟩. ⟨hal-04651848⟩
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