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Fragmentation and ionization of C70 and C60 by slow ions of intermediate charge
Stockholm University, Faculty of Science, Department of Physics. (atom)
Stockholm University, Faculty of Science, Department of Physics. (atom)
Stockholm University, Faculty of Science, Department of Physics. (atom)
Stockholm University, Faculty of Science, Department of Physics. (atom)
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2006 (English)In: European Physical Journal D: Atomic, Molecular and Optical Physics, ISSN 1434-6060, E-ISSN 1434-6079, The European physical journal D Atomic, molecular and optical physics, Vol. 38, no 2, 299-306 p.Article in journal (Refereed) Published
Abstract [en]

  

 

 

 

 

 

    

 

 

 

 

 

 

 

  

 

We have measured total and coincident (with outgoing charge-state analyzed projectiles) ionization

and fragmentation spectra of C

 

60 and C70 following collisions with Xe4+ and Kr4+ at v = 0.

06 a.u.

Intact positive fullerene ions in charge states up to five (C

 

5+

60

 

and C

5+

70

 

) are produced with both projectiles

and for Kr

 

4++C70 collisions we even observe a small C

6+

70

 

peak. The C

3+

60

 

/702m (m

= 1–7) intensity distributions

are predominantly associated with the stabilization of three electrons on the projectile (

 

s

= 3) and

are significantly different for Xe

 

4+- and Kr4+

-projectiles. On the other hand, we find remarkable similarities

in the C

 

+

3

 

-C

+

11

 

multi-fragmentation pattern regardless of projectile species (mass) although they are

associated with closer encounters in which the projectile is fully neutralized (

 

s

= 4). Simple Monte Carlo

calculations of nuclear and electronic loss processes show that both these contributions are very similar

in glancing Xe

 

4++C60 and Kr4++C60

collisions, suggesting that frontal (and more violent) collisions are

strongly suppressed under the present experimental conditions. Nevertheless it is surprising that the more

distant collisions (

 

s = 3) are projectile mass dependent, while the closer collisions (s

= 4) are not. This

indicates that this simple approach (although it reproduces more advanced quantum mechanical calculations

for slow collisions with

 

singly

charged atomic ions rather well) is not valid for a comprehensive

description of the energy transfer processes in the present collision systems involving projectiles of higher

charge states.

Place, publisher, year, edition, pages
Springer , 2006. Vol. 38, no 2, 299-306 p.
Keyword [en]
34.70.+e Charge transfer – 36.40.Qv Stability and fragmentation of clusters – 36.40.Wa Charged
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:su:diva-12595DOI: 10.1140/epjd/e2006-00005-7OAI: oai:DiVA.org:su-12595DiVA: diva2:179115
Available from: 2008-01-15 Created: 2008-01-15 Last updated: 2017-12-13Bibliographically approved

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Publisher's full texthttp://dx.doi.org/10.1140/epjd/e2006-00005-7

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Zettergren, HenningReinhed, PeterSchmidt, HenningCederquist, Henrik
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