Orientation dependence of NO sticking and scattering at Pt (100)

✍ Scribed by H. Müller; G. Zagatta; N. Böwering; U. Heinzmann

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 482 KB
• Volume: 223
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(94)00440-4

✦ Synopsis

Gas

-phase oriented NO molecules are focused onto a Pt( 100) surface in a supersonic molecular beam. The total number of the scattered and desorbed NO molecules is determined from recordings of the relative partial NO pressure. This signal shows a strong dependence on the initial NO orientation (preferential Nend or O-end collisions) and surface temperature. Apart from a direct chemisorption channel, the results show that there may be an orientation-dependent effect for the NO molecules trapping into a precursor state. Both channels occur in favor of N-end collisions at surface temperatures between T,= -120°C and T,= 1OOT.