On the translationally activated dissociative chemisorption of hydrogen and deuterium at a nickel (111) surface

✍ Scribed by D.O. Hayward; A.O. Taylor

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 534 KB
• Volume: 146
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(88)87434-7

✦ Synopsis

A statistical model has been developed which accurately describes the dependence of the sticking probability at normal incidence (S.) on translational energy (Et) for HZ and D, on a Ni( 111) surface according to the equation S,=CE;' (E, -&)*, where E0 (the threshold energy) and Care constants which are equal to 0.85 kJ mol-' and 0.02 mol l& ', respectively. This result is consistent with a "freely" rotating transition state complex. For a surface temperature 'f, of 1143 K the model yields an angularly independent mean energy of desorption of 3.09kT,, which is in reasonable agreement with the experimental result of 2.9kT,.