Full quantum mechanical studies of the H + H2 reaction cross section

The reaction cross sections for the collision H + H2 (υα = 0, jα = 0) →H2(υβ, jβ) + H have been obtained by a full quantum mechanical coupled channel distorted wave approximation (CCDWA) calculations on the three potential-energy surfaces (PESs). The reaction cross sections have been compared with the quasiclassical trajectory (QCT) results and other calculations which have been regarded commonly as exact. A good agreement has been found between the CCDWA and the exact reaction cross sections for the H + H2 reactions on the same PES. The discrepancy between the exact calculations and QCT results is remarkable