3-DIMENSIONAL CALCULATIONS OF COLLISION-INDUCED DISSOCIATION IN HE-ORDER-SUDDEN APPROXIMATION(H2 USING INFINITE)

Quantum mechanical calculations of three-dimensional dissociative He+H -2 collisions are made using an infinite-order-sudden approximation. V ibrational and dissociative motions are treated accurately in the dire ct numerical method of Sakimoto and Onda [J. Chem. Phys. 100, 1171 (19 94)]. The dissociation cross sections for all the initial vibrational states (v=0-14) are presented at the total energy E=8 eV. The dissocia tion cross section becomes much larger for higher v. The dissociation mechanism is different depending on the collision configuration. Two m odes of dissociation are found to be important: The dissociation occur s (1) through the compressive action on the vibrational motion of H-2 and (2) through the expansive action on the vibrational motion. (C) 19 97 American Institute of Physics.