Fluorescence decay processes following resonant 2p photoexcitation of Ar atoms and clusters studied using a time-resolved fluorescence and photoion coincidence technique

摘要

The novel spectroscopic technique of time-resolved fluorescence-photoion coincidence spectroscopy (TFPICO) has been applied to the investigation of the decay processes of 2p inner-shell excited Ar atoms and clusters. For the Ar atom, only that fluorescence accompanying the production of Ar~+ showed a strong dependence on excitation energy. This dependence is discussed in terms of competing Auger decay processes. For Ar clusters, the TFPICO spectra for dimer ions (Ar2)~+ revealed long-lifetime fluorescence components which can be attributed to the 'third excimer continuum'. With this work we demonstrate the usefulness of this technique for investigating the decay processes of inner-shell excited atoms and clusters.