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 stimu lated desorption of metastables from the surface of solid Kr was inves tigated. At the clean surface of solid Kr, the desorption of Kr metast ables occurs only through an excimer dissociation mechanism. Physisorp tion of hydrogen molecules causes the following effects: (1) the total desorption yield of the metastable species increased by an order of m agnitude or more; (2) metastable Kr, which is probably desorbed throug h the cavity ejection mechanism, emerges; (3) metastable Kr by excimer dissociation is also enhanced; and (4) a new metastable species, whic h seems to be composed of metastable hydrogen molecule, appears. (C) 1 997 Elsevier Science B.V.