Size-effects in clusters and free nanoparticles probed by soft X-rays

Recent progress from experiments on clusters and free nanoparticles is reported, where emphasis is put on studies in the soft X-ray regime. We review selected examples on the characterization of free molecular clusters and nanoparticles. Specifically, we discuss recent progress in changes of the local structure in free clusters. Photoemission and particle charging as well as elastic light scattering from free nanoparticles are reported. These approaches permit the characterization of the intrinsic properties of nanoscopic systems as building blocks of nanoscopic matter and possible nanomaterials.