Mechanism of negative ion formation in low velocity collisions at surfaces

✍ Scribed by B. Bahrim; B. Makarenko; J.W. Rabalais

• Book ID: 104202015
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 129 KB
• Volume: 542
• Category: Article
• ISSN: 0039-6028
• DOI: 10.1016/s0039-6028(03)01026-4

✦ Synopsis

Theoretical calculations using the coupled angular modes (CAM) method have been used to interpret experimental findings related to the scattered oxygen negative ion fraction (O À ) in collisions of low energy O þ with an Al(1 1 0) surface. The increasing O À ion fraction observed experimentally at low O þ velocities can be explained in terms of the distance of closest approach Z c to the Al surface and the specific charge state of the projectile at this distance. Both Z c and the charge state influence the charge transfer process between the projectile and the surface at low collision energies.