Dissociation dynamics of Na+n in collision with rare-gas atoms

Nonose, Shinji; Tanaka, Hideki; Mizuno, Tomoyuki; Kim, Nam Jun; Someda, Kiyohiko; Kondow, Tamotsu
November 1996
Journal of Chemical Physics;11/22/1996, Vol. 105 Issue 20, p9167
Academic Journal
Dissociation dynamics of a sodium cluster ion, Na+n (n=2–9 and 11), in collision with a rare gas atom (He or Ne) was investigated by measuring the absolute cross sections for the production of fragmented ions by using a tandem mass-spectrometer equipped with several octapole ion guides. The mass spectra of the fragmented ions show that release of Na and/or Na2 from Na+n occurs dominantly. The absolute total cross section for the dissociation of Na+n and the absolute partial cross sections for the Na and/or the Na2 release were determined at different collision energies and cluster sizes. The absolute total dissociation cross sections were calculated by a scheme that collisionally excited Na+n dissociates with leaving Na and Na2 unimolecularly. On the other hand, the partial cross sections for the Na and the Na2 release were successfully explained by the orbital correlation diagram for the dissociation system; the dissociation channel involving an adiabatic transition was found to be influenced significantly by the collision energy and the cluster size. © 1996 American Institute of Physics.


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