LEED/Auger Spectroscopy Study of the Adsorption of Alkali Metals on Mo(110)

LEED and Auger electron spectroscopy have been used to study the adsorption of Na, K, Rb, and Cs on a Mo(110) surface. Alkali ions were deposited (at room temperature; pressure ${\text{<1×10}}^{\text{−10}}\hspace{0.17em}\mathrm{Torr}$ ) from zeolite ion sources which enabled the absolute coverage to be measured. Peak-peak heights of Cs-47, K-251, Rb-56 and 75 eV Auger peaks and of Mo Auger lines were monitored as a function of coverage. Quantitative estimates of Na adsorption could not be made using AES owing to the low Auger yield of Na. LEED patterns showed a hexagonal close packed arrangment of the alkalis on Mo(110).