Adsorption of alkali metals on W(100) : an EELS study

J. Cousty , R. Riwan , P. Soukiassian

Room temperature adsorption of Na and K on the W(100) face is studied by work function changes, LEED and angular resolved electron energy loss spectroscopy (EELS). C(2 x 2) patterns are observed up to the monolayer for both alkalies. At low coverage, this pattern is interpreted as the result of a reconstruction of the W(100) face induced by alkali adsorption. The changes of the energy loss versus alkali coverage exhibit a deep (shallow) minimum for Na(K). Collective oscillations are assumed for coverage beyond the minima. This behaviour is discussed in regard to previous studies, particularly that of Cs on W(100). We conclude that the bonds between Na, K and Cs atoms and the W(100) face have the same nature.

Mots clés: adsorption; alkali metals; electron energy loss spectra; low energy electron diffraction; surface structure; tungsten; work function

Domaines: Articles anciens

J. Cousty, R. Riwan, P. Soukiassian. Adsorption of alkali metals on W(100) : an EELS study. Journal de Physique, 1985, 46 (10), pp.1693-1698. ⟨10.1051/jphys:0198500460100169300⟩. ⟨jpa-00210119⟩