Thermally induced chemistry and electron-mediated processes of pyridine on (2×1) and modified Si(1 0 0) surfaces: evidence of electron-induced condensation oligomerization

✍ Scribed by Q Li; K.T Leung

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 337 KB
• Volume: 541
• Category: Article
• ISSN: 0039-6028
• DOI: 10.1016/s0039-6028(03)00890-2

✦ Synopsis

The room-temperature (RT) adsorption and surface reactions of pyridine on Si(1 0 0)2 • 1 have been investigated by thermal desorption spectrometry, low-energy electron diffraction, and Auger electron spectroscopy. In addition to molecular desorption, evidence of dissociation into smaller fragments, including C 2 H 2 and atomic hydrogen, was also found upon thermal desorption of pyridine chemisorbed on Si(1 0 0)2 • 1 at RT. Other possible surface processes such as hydrogen abstraction, fragmentation and dissociative desorption have also been identified on Si(1 0 0)2 • 1 surfaces modified by sputtering, and pre-and post-exposure of molecular oxygen and of atomic hydrogen. Evidence of condensation oligomerization of pyridine at RT has been found on Si(1 0 0)2 • 1 upon irradiated by low-energy electrons and on an oxidized Si surface even without electron mediation.