Phys. Rev. A 65, 052724 (2002) [3 pages]Doubly charged negative ions via charge-exchange collisions: C60F36-+CH4→C60F36-2+CH4+Received 7 January 2002; published 9 May 2002 Studies of electron transfer from a molecule (CH4) to a negative ion (C60F36-) at low-ion collision energies (4 to 10 keV) are reported. The center-of-mass energy threshold for the reaction C60F36-+CH4→C60F36-2+CH4+ is found to be ∼60 eV, which is well above the estimated thermodynamic endoergicity [Vi(CH4)-Ae(C60F36-)∼10eV]. Dissociative charge transfer to produce C60F35- and C60F34- is also observed but much less probable. Collisions of other negative ions with neutral molecules (notably C84-) did not result in a detectable signal of doubly charged negative ions. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.65.052724
DOI:
10.1103/PhysRevA.65.052724
PACS:
34.70.+e
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