Desorption of metastable species induced by electronic excitation at the surface of solid krypton with physisorbed hydrogen

The effect of the physisorbed hydrogen molecules on the electron stimulated desorption of metastables from the surface of solid Kr was investigated. At the clean surface of solid Kr, the desorption of Kr metastables occurs only through an excimer dissociation mechanism. Physisorption of hydrogen molecules causes the following effects: (1) the total desorption yield of the metastable species increased by an order of magnitude or more; (2) metastable Kr, which is probably desorbed through the cavity ejection mechanism, emerges; (3) metastable Kr by excimer dissociation is also enhanced; and (4) a new metastable species, which seems to be composed of metastable hydrogen molecule, appears.