Scattering of molecular chlorine from clean and hydrogen-covered tungsten

Using a modulated beam technique, the scattering of Cl 2 from tungsten is shown to be consistent with a model in which dissociative adsorption is accompanied by strong bulk diffusion effects. The (W Cl) bond strength is found to be ≈470 kJ/mole, confirmed by reactive scattering with adsorbed hydrogen and direct HCl adsorption.