The dynamics of the reaction D+2+F(2P)→FD++D at kinetic energies between 0.002 and 30 eV

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Abstract
The merged molecular beam technique has been used to study the reaction D+2+F(2P)→FD++D over the kinetic energy range from 0.002 to 30 eV. The energy dependence of the absolute total reaction cross section at low kinetic energies indicates that reaction occurs with unit probability for capture collisions on potential energy surfaces which correlate with Π intermediates. This result is consistent with the adiabatic state correlations, which connect the reactants to the ground state products FD+(2Π)+D(2S) via both the 1Π and 3Π surfaces in collinear approches. At higher energies, an inflection in the reaction cross section is thought to be caused by onset of the endoergic reaction to give excited state products FD+(2Σ)+D(2S). The reaction mechanism is direct over the entire range of collision energies, with the FD+ product scattered preferentially in the direction of the incident F‐atom reactant in the center‐of‐mass system, except for extremely high collision energies (Ei=25 eV), where a roughly symmetric distribution is seen. Very little theoretical work has been carried out on the dynamics of reactions between two open‐shell species. The relative simplicity of the D+2+F(2P) system makes it an attractive candidate for such studies.

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