Quenching future research

The influence of the electronic entropy on the height of fission barriers has not been studied as yet, but it will undoubtedly be the subject of future research in metal-cluster physics. In any case, based on the results of this section, it is natural to conjecture that electronic-entropy effects will tend to quench the barrier heights, especially in the case of larger multiply charged clusters. 

Future Areas of Research. There are certain future experi-ments that are very important for further understanding of the work reported here. The most important ones concern lifetime measurements of the quenching of isopropanol. Secondly, the mechanism of quenching must be understood. Electron paramagnetic resonance experiments will be helpful here. More bulk photolyses and other organic quenchers need to be studied, especially variable size quenchers, in order to help understand diffusional processes in these zeolites. We are presently studying the surfaces of these zeolites with ion scattering spectrometry and secondary ion mass spectrometry. The preliminary results indicate that we... 

From the examples shown it became clear that most studies have been motivated so far from the structural point of view. As a typical example, lightharvesting chlorophyll dye assemblies motivated researchers to design por-phyrinoid model systems. For synthetic reasons chlorin dyes were substituted by porphyrin dyes and the magnesium ion was substituted for other metals like cobalt (e.g. Hunters cychc array 17). As a consequence even though the metal-assembled structures look quite related to the natural counterparts, the properties are so different that photophysical studies on these assembhes have not even been initiated (because cobalt totally quenches the fluorescence of the porphyrins). This example clearly points towards our future goal... 

---