Dynamical Resonances in Collinear, Coplanar, and Three-Dimensional Quantum Mechanical Reactive Scattering

We present results of one-, two-, and three-dimensional calculations for the H + ${\mathrm{H}}_2$ exchange reaction which provide the first evidence for dynamical internal excitation (Feshbach) resonances in chemical reactions using noncollinear calculations. The change of the resonance energy and width with collision dimensionally and with total angular momentum is analyzed and indicates the existence of observable effects on certain reactive cross sections.