Stability and fragmentation processes of highly charged sodium clusters |
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Authors: | G E Ntamack F Chandezon B Manil H Lebius S Tomita C Guet M G Kwato Njock and B A Huber |
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Institution: | (1) CIRIL, CEA-CNRS-ISMRA, Rue C. Bloch, 5133, 14070 Caen Cedex 05, France;(2) Present address: DRFMC, CEA-Grenoble, France;(3) Present address: Institute of Physics and Astronomy, Aarhus, Denmark;(4) Present address: DPTA, CEA-Ile de France, France;(5) Present address: Center for Atomic Molecular Physics and Quantum Optics, Douala, Cameroon |
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Abstract: | Highly charged sodium clusters produced in collisions
between neutral clusters and multiply charged ions are formed
within a large range of temperatures and fissilities, and
identified by means of a high-resolution reflectron-type
time-of-flight mass spectrometer ( m/m
14000). The limit of stability of these charged clusters is
experimentally investigated, and the time-of-flight spectra are
compared with theoretical spectra based on Monte-Carlo
simulations. The results indicate that the maximum fissility
(X) of stable clusters is
approaching the Rayleigh limit (X = 1) for larger clusters sizes. It is
mainly limited by the initial neutral cluster temperature (
T 100 K) and the energy
transfer in the ionizing collision. In addition, the comparison
between the measured and simulated spectra suggests for high
cluster charges a multi-fragmentation process, in which most of
charge is emitted, creating low charged residual cluster ions. |
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Keywords: | 36 40 Wa Charged clusters 34 70 +e Charge transfer 36 40 Qv Stability and fragmentation of
clusters 61 46 +w Nanoscale materials: clusters nanoparticles nanotubes and nanocrystals |
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