SITE-SPECIFIC EXCITATION IN FREE KRYPTON CLUSTERS

Site-specific excitation in Kr clusters is investigated by high resolu tion inner-shell excitation in combination with model calculations, wh ich are based on a core exciton model. Partial cation and total electr on yield spectra of variable size Kr clusters are reported for the Kr 3d excitation regime (90-96 eV) using synchrotron radiation. A cluster size-dependent spectral evolution is observed, corresponding to the t ransition from low lying cluster Rydberg states into surface and bulk exciton states. The results indicate that individual sites in perfectl y and imperfectly shaped clusters are clearly distinguished.