Volume 74, Number 6, June 2006
|Page(s)||985 - 991|
|Section||Atomic and molecular physics|
|Published online||24 May 2006|
High formation yields of negative ions in multicharged fluorine - collisions
Laboratoire de Spectrométrie Ionique et Moléculaire, Université Claude Bernard Lyon 1, UMR CNRS no. 5579 - 43 boulevard du 11 Novembre 1918 69622 Villeurbanne Cedex, France
2 Institute of Modern Physics, Chinese Academy of Sciences - Lanzhou 730000, PRC
Accepted: 24 April 2006
We have measured the yield of negative fluorine ions in F()-C60 collisions at low velocity (). These yields are found surprisingly high, up to 7.1% for F+ and 1.1% for F3+, much higher than the yields measured with atomic targets, typically 0.1%. From the measured kinetic energy loss of scattered F- ions we have estimated the impact parameter of the collision. A direct population of the ground state of the negatively charged projectile by a collective electron transfer is proposed as a possible mechanism to account for the high negative ion formation yields.
PACS: 34.70.+e – Charge transfer
© EDP Sciences, 2006
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