Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)

A 12.18: Poster

Donnerstag, 5. April 2001, 12:30–15:00, AT3

Ionization and fragmentation in Pb⁵⁴⁺-, Xe³⁰⁺-, and Ar⁸⁺ - C₆₀ collisions — •Jens Jenses¹, Alexander Langereis¹, Henning Zettergren², Stefan Schwartz², Henning Schmidt², Afshin Fardi², and Henrik Cederquist² — ¹Manne Siegbahn Laboratory, Stockholm, Sweden — ²Stockholm University, Frecativägen 24, S-104 05 Stockholm, Sweden

We present measured distributions of intact and fragmented C₆₀-ions in coincidence with stabilization of s electrons on the projectiles in Pb⁵⁴⁺-, Xe³⁰⁺- and Ar⁸⁺-C₆₀ collisions. The Ar⁸⁺-C₆₀ spectra are consistent with those already published [1] but the mass resolution has been improved by more than one order of magnitude revealing, e.g., doubly charged light fragments (C₁₁²⁺, C₁₃²⁺ and C₁₅²⁺) in coincidence almost exclusively with collisions in which s=3. The highest charge of an intact C₆₀^r+ recoil ion was r=7 for Ar⁸⁺. The comparatively low intensity of the Pb⁵⁴⁺-beam only allowed measurements of one, two, three or four stabilized electrons yielding a maximum target charge for intact C₆₀ of r=8 in spectra virtually free of fragmentation. This shows that cold highly charged molecular ions are efficiently created at high q. At the time of writing the, Xe³⁰⁺-C₆₀ measurements are not completed but we hope that our high mass resolution will be helpful in the search for the maximum charge of intact (metastable) C₆₀. 1mm [1] H. Cederquist et al., Phys. Rev. A 61, 022712 (2000).