Abstract
This study is aimed at testing the validity of the “velocity correlated cluster emission” effect using a large polyatomic projectile [as reported earlier in: E. Armon et al, PRL 113, 027604(2014) and JCP 150, 204705 (2019)] also for light metallic targets. We have bombarded an aluminium target by 14 keV C60- ions resulting in the emission of pure Aln+ (n = 1–16) and mixed AlnCm+ cluster ions. Kinetic energy distributions (KEDs) were measured for the emitted Aln+ (n = 1–14) ions. It was found that similarly to that observed for the heavy metallic targets, the KEDs of the large Aln+ (n ≥ 7) clusters can be described with a shifted Maxwellian using a single pair of fitting parameters (temperature and center-of-mass velocity) but with a weaker increase of most probable energies with cluster size. An explanation in terms of mass effect is proposed.
Published Version
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