Quantum state-to-state cross sections for atom-diatom reactions: A Chebyshev real wave-packet approach

We describe the implementation of a quantum mechanical method to calculate state-to-state differential cross sections for atom-diatom reactive scattering processes. The key ingredient of this approach is the efficient and accurate propagation of a real scattering wave packet in the Chebyshev order domain, from which the S-matrix elements can be extracted. This approach is implemented with Open MP and applied to compute differential and integral cross sections for the direct H+H₂ abstraction reaction and the more challenging N(²D)+H₂ insertion reaction.