Differential cross sections and Regge trajectories for the F+H2→HF+H reaction

We analyse reactive angular scattering in the F+H-2 --> HF + H reaction using accurate S-matrix elements. With the help of the Pade approximation we obtain positions of the resonance poles of the S-matrix in the complex planes of both energy (E) and total angular momentum (J). We reconstruct the Regge trajectories and correlate the Regge poles affecting angular scattering at higher energies with a resonance pole at J = 0. Even though the lifetime of the resonance is short, the lifeangle of the corresponding Regge state is large enough to enhance forward scattering.