Six-Dimensional Quantum Dynamics of Adsorption and Desorption of H_2 at   Pd(100): No Need for a Molecular Precursor Adsorption State
  We report six-dimensional quantum dynamical calculations of dissociative adsorption and associative desorption of the system H_2/Pd(100) using an ab-initio potential energy surface. We focus on rotational effects in the steering mechanism, which is responsible for the initial decrease of the sticking probability with kinetic energy. In addition, steric effects are briefly discussed. 
Axel Gross, Steffen Wilke, and Matthias Scheffler   (Fritz-Haber-Institut, Berlin)