Experimental Studies on Atomic Collisions

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Main subjects of this program are interactions involving multiply charged ions and aspects of collision spectroscopy of electrons, ions and photons with atoms and molecules. During three years, an compact Electron Beam Ion Source (EBIS) and an ECR Ion Source were designed and constructed at Tokyo Metropolitan University and The Queen's University of Belfast, resperctively. Besides the construction of the two ion sources, scientists of Japan and the UK could share the expertise and specialized facilities by the exchange visits of more than 15 scientists.Cross sections of electron capture processes in collisions of multi-charge ions with atoms and molecules were measured with the EBIS at TMU. Coulomb explosion of multi-chrge molecularions produced by collisions of highly charged ions was studied. State-to-state studies of charge transfer reactions of multiply charged ions with atoms and molecules were made by using the ECR ion source at QUB. Ionization processes of metal atoms in collisi … More ons of fast ions were also studied at QUB.Post Collisions Interactions (PCI) in collisions of electrons with atoms and molecules were studied by using electron spectrometers at the University of Manchester and The University of Electro-Communications, respectively. The PCI effect in ionization of Hg atom was found at the U.M.. The similar effect was also found in a to 2e processes of N_2O molecule by using the spectrometer at The UEC which is specially designed for chemically active gases.Two dimensional photo-electron spectra of molecules measured with Synchrotron Radiation at Daresbury Laboratory. The dissociation processes of molecules via super-excited states of molecules were also studied at Daresbury. Covariance mapping technique developed at The University of Reading seems very valuable for study of dissociation processes of multiply charged molecular ions.UK-Japan Seminar on Experimental Atomic Collision Physics was held at Tokyo and Shizuoka to discuss the results obtained by exchange visits and the further promotion of the collaboration between Japan and the UK. Less