Abstractive chemisorption of O2 on Al(111).
We present experimental evidence that abstraction is a common mechanism (approximately 50%) in the dissociative chemisorption of oxygen on Al(111) at a translational energy of 0.5 eV. As a result of this mechanism, individual isolated O-atoms are observed in scanning tunneling microscopy (STM). At this translational energy ordinary dissociative chemisorption processes also occur, resulting in pairs of adatoms. The ejected O-atoms originating from the abstraction reaction are detected in the gas phase using laser spectrometry. Together, these observations provide compelling evidence for the abstraction mechanism.
Fachbereich Chemie, Universität Essen, Germany.
M
M
Binetti
O
O
Weisse
E
E
Hasselbrink
A J
AJ
Komrowski
A C
AC
Kummel