| In this thesis the electronic structure of CdSe and CdS nanocrystals ranging in size from 10-100 A diameter is discussed. These systems are made in a wet chemistry laboratory and a number of diffraction studies indicate that their internal structure is highly crystalline. Photoemission spectroscopy of the valence band of CdS indicates that both quantum confinement and charge solvation play a role in determining the energy of the highest occupied molecular orbital. Stark effect spectroscopy probes the initially prepared excited state, and from the lineshapes measured the excited state of these spherical particles was determined to be dipolar. Synthetic techniques for the preparation and characterization of monolayers and multilayers of clusters on metals are presented in this work. Such samples are useful not only for non-optical spectroscopies, but also for the fabrication of electroluminescent devices. |
