| Issue |
Europhys. Lett.
Volume 74, Number 6, June 2006
|
|
|---|---|---|
| Page(s) | 985 - 991 | |
| Section | Atomic and molecular physics | |
| DOI | https://doi.org/10.1209/epl/i2006-10055-3 | |
| Published online | 24 May 2006 | |
High formation yields of negative ions
in multicharged fluorine 
-
collisions
1
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
Received:
9
March
2006
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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