title: Eley-Rideal recombination of hydrogen atoms on a tungsten surface.
abstract: The Eley-Rideal recombination reaction of H chemisorbed on the four-fold site of W(001) at a surface temperature T(S) = 500 K is studied using the fully three-dimensional semiclassical collisional model and an accurate potential energy surface for the H-W(001) system. The recombination probability, calculated at different collisional energies in the range (0.05-5) eV, shows a broad maximum around 0.4 for energies between 0.1 eV and 2.5 eV. The exothermic energy partitioning in the final states of the desorbing H(2) molecules shows that, at low impact energies, only the first three vibrational levels of the hydrogen molecule are energetically accessible, while at the higher impact energies vibrational levels up to v = 7 can be populated. The energy exchanged with the phonons surface is small but not negligible.
authors: CNR-Institute of Inorganic Methodologies and Plasmas, Via Amendola 122/D, 70126 Bari, Italy. maria.rutigliano@cnr.it
authors: M
authors: M
authors: Rutigliano
authors: M
authors: M
authors: Cacciatore