Study of the solvation Dynamics of Clusters using Femutosecond Spectroscopy

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(1) Electronic spectra of Li(H2O)a have been measured using photodissociation spectroscopy. the spectra for larger clusters have been found to converge to the absorption spectra balk hydrated electron. We have also measured the lifetime of the 1:1 complex with pump-prove technique using a femtosecon laser and found an extremely fast internal conversion process.(2) Photoelectron spectra of Nam(NH3)[1 clusters have been investigated to examine the solvation of metal aggregates in small ammonia clusters. We have found that N% starts to dissolves even in clusters with three NH3 molecules.(3) Electronic spectra and photodissociation process of Mg(NH3)n have been investigated in order to explore the size dependence of the oxidation mode of Mg*. We have found the redox reactions of Mg+-water clusters for n<3 and the oxidation of Mg* to produce Mg2t for larger clusters. The two-photon ionization process of Mg(NH3)n has also been investigated using the femtosecond laser and obtain new results on the stability of Mg2+ in clusters.(4) A mass spectrometer with electrospray ionization source has been newly constructed to study the spectroscopy of nonvolatile ions. We have investigated the photodissociation process of hemin-(dimethyl surfoxide)n clusters and clarified the mechanism of b-cleavage reaction. We have also examined the photoionization process of the gas-phase cytochrome cions.