Gordon Research Conference Poster

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C60+ Reactions with Alkali Metals in an rf Trap

Douglas Cameron, Mordechai Rokni, and Joel Parks
Rowland Institute for Science, Cambridge, Massachusetts 02142-1297

AbstractC60 plus Li

        Ion-neutral interactions between alkali atoms and a trapped cloud of C60+ ions was studied in an rf Paul trap. The ion cloud temperature was maintained at ~80K by collisions with a dilute He background gas. Dissociative charge-exchange was measured for Na, K, Rb and Cs with alkali-C60+ collision energies of ~60 to 120 meV set by the alkali atom velocity. At temperatures below ~170K, the growth of LinC60+ clusters (n=1-18) occurs by the sequential association of Li atoms. Charge-exchange rates are derived from measurements of the time decay of C60+ ions. In the unique case of LiC60+, pressure dependence of formation displays a competition between vibrational relaxation by He collisions and unimolecular dissociation. Rate equation analysis provides a measurement of the Li binding energy and the rate of vibrational relaxation. For all other cases, LinC60+ n>1, cluster formation occurs with negligible dissociative loss.

              

C60+ Reactions with Alkali Metals in an rf Trap
Douglas Cameron, Mordechai Rokni, and Joel Parks

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