Thermal desorption of neutral Cs from (100) with and without pre-adsorbed oxygen occurred from discrete binding states at high Cs coverage and a continuum of states at low coverage. The two discrete binding states had activation energies of 1.2 and 1.5eV on clean (100), which shifted to 1.4 and 1.7eV with oxygen pre-adsorption and were independent of Cs coverage. The terminal coverage Cs desorption energy increased from 2.3 to 3.0eV as a result of an oxygen underlayer, consistent with the formation of Cs-O bonds between the two chemisorbed layers. The adsorption of Cs on either surface was apparently limited to a single layer at room temperature. Cs ion desorption was observed from the oxygen-covered surface at low (θCs ≤ 0.08) coverage, with an evaporation energy of 2.5eV. All Cs desorption reactions occurring on these surfaces were first-order processes.

Cesium and Oxygen Coadsorption on LaB6 Single Crystal Surfaces. II. Thermal Desorption of Cesium from LaB6(100). Chambers, S.A., Davis, P.R., Swanson, L.W.: Surface Science, 1982, 118[1-2], 93-102