Core excitation energies characterization

Consider the amplitude for the creation of secondary electrons upon atom excitation by electron impact. As a result of the Coulomb interaction with the atom, the incident electron loses a part of its energy and goes into an inelastically scattered, state and the atom goes into an excited state characterized by a core hole and a secondary electron. In the context of the single-electron approach, the initial state of the system is characterized by i) = w, a) and the final states are characterized by I/) = Ip, ) where u)) and h) are single-electron wave functions of the incident and inelastically scattered electrons, and p) and a) are singleelectron wave functions of the secondary election and the core level electron, respectively. Then the amplitude for creation of the secondary electron is defined by the matrix element... 

In this work, we present two related concepts of dendrimer use which have evolved in recent years. Both conceal the multivalency and the active framework features, although in so called opposite directions . The first concept, which is introduced in section 2, is the idea to use of dendrimers as light harvesting antennae. Here, the active framework serves as an energy funnel, which directs excitation energy from donors placed at the periphery of the dendrimer to its core, where an acceptor molecule is placed. We describe the process as a random walk of excitations on the dendrimeric framework, and present characterization of the efficiency of such possible antennae (see Figure 4). 

Fluorescence in the visible and ultraviolet regions of the spectrum provides a convenient means for detecting decay produts, both neutral and ionic, produced in excited electronic states. Fluorescence spectra with resolved rotational and vibrational structure provide information about the energy spacing between electronic states, about the structure and bonding properties of these states, and about the populations of rotational and vibrational levels, which can characterize the populating mechanisms associated with decay of the core hole excited state. The production of the doubly charged molecular cation by decay of the core hole is of particular interest because little is known about the properties of these ions and because the fluorescence decay... 

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