2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14144We present quantum mechanical and quasiclassical trajectory calculations of cross sections for rovibrational transitions in ortho- and para-H_2 induced by collisions with He atoms. Cross sections were obtained for kinetic energies between 10^-4 and 3 eV, and the corresponding rate coefficients were calculated for the temperature range 100<T<4000 K. Comparisons are made with previous calculations.21 pages, 2 figures, AAS, epsfAstrophysicstext