Interaction of alkali-metal overlayers with oxygen

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Abstract
The interaction of oxygen with alkali metals (Li, Na, K, and Cs) was studied with valence and core-level photoemission (PE) using synchrotron radiation and by multiple mass thermal desorption (TDS). During a stepwise coadsorption of oxygen at 80 K, an increase in the emission intensity, a linewidth broadening, and a negative binding-energy shift of alkali-metal core levels is observed. Two stages of oxygen adsorption are identified in PE and TDS. In the low O2 exposure range, an oxide species is formed; at higher exposures, peroxide and superoxide species are observed in Na, K, and Cs. The potassium–oxygen interaction is discussed in detail.

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