摘要：

A new and versatile photoelectron-photoion coincidence spectrometer has been developed and advanced to facilitate for the first time the investigation of the valence electronic structure of isolated metal atom clusters up to a mass range of approximately 40000 amu. The neutral cluster distribution, which is synthesized in a doubly skimmed seeded supersonic molecular beam, is probed 130 mm down-stream by the pulsed and monochromatized output of a newly developed sub-nanosecond vacuum-UV/UV-flashlamp in the photon energy range between 3 and 11.8 eV. Single photoelectrons are energy analyzed and time-correlated detected either in a field-free or in a magnetic type time-of-flight spectrometer. The corresponding cluster cations are mass analyzed and counted in coincidence in a modified Wiley-McLaren time-of-flight mass spectrometer. The data acquisition electronics is capable of recording and storing simultaneously photoion-photoelectron coincidence spectra of all those neutral clusters tha

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