The complex angular momentum (CAM) route to reactive scattering resonances: from a simple model to the F+H2→HF+H reaction

We advocate the use of the complex angular momentum (CAM) approach for quantitative analysis of the resonance effects in reactive differential and integral cross sections. We start by reviewing a simple potential scattering model and progress to analyse the F+H2(v=0,j=0)→HF(v' =2,j' =0)+H reaction recently considered by Cavalli and De Fazio (2007 Phys. Scr. 76 C21) within the conventional complex energy plane approach. We argue that although the two approaches have the same origin, preference may be given to the CAM method whenever a quantity of interest is obtained by summing a partial wave series.