ANGULAR AND KINETIC-ENERGY DISTRIBUTIONS OF THE DESORPTION OF NE METASTABLE INDUCED BY EXCITONS AT THE SURFACE OF SOLID NE

The origin of the Ne metastables desorbed by excitonic excitations was investigated. The measurement of the angular and kinetic energy distr ibutions of Ne metastables and their excitation energy dependence reve aled that there are, at least, five components desorbed through differ ent desorption kinetics: excimer dissociation species from the higher- order exciton, cavity ejection from three kind of surface excitons, an d ejection of metastables from a bulk exciton in an underlying layer. The metastable desorbed through the cavity-ejection mechanism by the e xcitation of the first-order surface exciton showed a narrow angular d istribution along the surface normal with an FWHM between 30 degrees a nd 90 degrees, which depends on the velocity of a desorbed Ne metastab le.