Abstract. The interaction of low-energy multiply charged Ar q+ (q ≤ 7) ions with a solid Ne surface is experimentally studied. Desorption of very large cluster ions Ne + n (n > 100) is observed. The size distribution of smaller (n = 1 ∼ 3) cluster ions depends strongly on the charge state of the incident ion, whereas that of larger (n > 7) cluster ions exhibits no dependence on the charge state, indicating that desorption of large cluster ions is due to kinetic sputtering. The potential sputtering yield is estimated by analyzing the size distribution of the desorbed cluster ions. The results suggest that the ion desorption mechanism, which is known as desorption induced by electronic transitions, can also be applied to the present results.
Desorption of cluster ions (Ne + n) from a surface of solid Ne following 1.2 keV Ar + ion bombardment has been investigated. We have measured the desorption yield of the cluster ions as a function of thickness of Neˆlm. Kinetic energy measurement of mass-selected clusters is also presented. These results allow us to discuss the desorption mechanism of the cluster ions.
Abstract. We investigated Ne+ ions and Ne + n (n = 2 − 20) cluster ions desorbed from the surface of solid Ne by 1.0 keV Ar + ion impact. Kinetic energy analysis shows a considerably narrower energy distribution for the Ne + n (n ≥ 3) ions than for the Ne + n (n = 1, 2) ions. The dependence of ion yields on Ne film thickness indicates that cluster ions (n ≥ 3) are desorbed only from relatively thick films. We conclude that desorbed ions grow into large cluster ions during the outflow of deep bulk atoms to the vacuum.
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