Monday, August 27, 2012

1208.4969 (Marius Schulte et al.)

Car-Parrinello Simulation of the Aluminium Oxidation: Questioning the
Role of 'Hot Adatoms'
   [PDF]

Marius Schulte, Irmgard Frank
We present Car-Parrinello molecular dynamics simulations of the initial reaction steps leading to an inert oxide layer on aluminium. The mechanism of the reaction of the aluminium surface with single oxygen molecules is analysed. After adsorption at the surface the oxygen molecules dissociate at a femtosecond timescale and the atoms are chemisorbed at the surface at a distance of several angstrom which falsifies earlier STM results. When the aluminium surface is exposed to higher oxygen pressure, a surface layer essentially consisting of threefold coordinated oxygen atoms starts to form.
View original: http://arxiv.org/abs/1208.4969

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