Journal of Chemical Physics, Vol.107, No.3, 786-790, 1997
On the Appearance of Resonances in Reactive Scattering - An Experimental-Study of the H+d-2-)Hd+d Reaction at Collision Energies Near 1.29 eV
The hydrogen exchange reaction H+D-2(v=0,j=0)-->HD(v’,j’)+D was investigated at collision energies between 1.27 and 1.30 eV in a high resolution crossed beam experiment. The angle-velocity distribution of nascent D-atoms was measured using the technique of Rydberg atom time-of-flight spectroscopy. The resolution of this technique allows the identification of individual ro-vibrational states of the associated HD product molecule. Calculations done on the Liu-Siegbahn-Truhlar-Horowitz (LSTH) potential energy surface (PES) explicitly including the Geometric Phase effect predict a resonance in reactive scattering for collision energies close to 1.29 eV. The experimental data do not show signatures of this resonance in the energy range investigated. Instead of this a general good agreement between experiment and theory even on the basis of state-to-state differential cross sections is already found for calculations on the LSTH PES at a collision energy of 1.30 eV not including the Geometric Phase indicating that this effect does not play an important role at these collision energies.