Abstract
We have investigated the initial stage of the oxygen uptake process at a Cs/Si(001) surface by metastable de-excitation spectroscopy (MDS) and by observing the electron emission induced by the incidence of oxygen molecules. MDS revealed that the amount of oxygen adsorbed at the topmost layer increases in parallel with the decrease of Cs 6s̃ intensity. However, the work function minimum occurred midway in this initial, monotonous, oxygen-uptake stage. The low-energy cutoff in electron spectra induced by oxygen molecules from the gas phase exhibited a variation in the local electrostatic potential (near the positions where a non-adiabatic process occurred for the incident oxygen molecules) different from the usual behavior of the work function. The mechanism of oxygen uptake is discussed in connection with the local structures of the electronic states and the electrostatic potential.
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