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A: Atomphysik
A 4: Clusters I: Metal Clusters (joint session A and MO)
A 4.4: Talk
Monday, April 2, 2001, 16:30–16:45, H1012
Sequential oxygen and metal atom addition in yttrium cluster anions: a comprehensive photoelectron spectroscopic study — •Axel Pramann1, Atsushi Nakajima1, and Koji Kaya2 — 1Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan — 2Institute of Molecular Science, Myodaiji, Okazaki, 444-8585, Japan
Axel Pramann, Atsushi Nakajima
Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522 Japan
Koji Kaya
Insitute of Molecular Science, Myodaiji, Okazaki, 444-8585, Japan
The evolution of the electronic structure of small yttrium oxide cluster anions is studied using the laser vaporization technique for cluster generation and photodetachment photoelectron spectroscopy (PES) of mass selected gas phase cluster anions.
PES experiments are performed at three wavelengths: 532 nm, 355 nm, and 266 nm. Generally, electron binding energies (BE) are increasing with increasing number of y atoms per cluster as well as with increasing oxidation state of yttrium.
Low BE main spectral features are contributed from metal d-band orbitals whereas the O 2p contribution is less dominant in the observed energy range. The different behavior of molecular and dissociative chemisorption of oxygen with respect to cluster size is discussed in terms of electronic structures and both sequential oxygen and metal atom addition to the preceding cluster.