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Ionization of water clusters by surface collision

✍ Scribed by A.A. Vostrikov; D.Yu. Dubov; M.R. Predtechenskiy

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 439 KB
Volume: 139
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(87)80163-x

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✦ Synopsis

We present experiments in which a beam of neutti #i,O), clusters are scsttered at various solid surfaces. ft is shown that at cluster sizes ~r~spond~ng to NS 300 cluster cations, anions and electrons appear in the scattered Bow. As Nincreases the current of cluster cations f, and anions I_ becomes greater. The currents I, and I_ are not identical and depend on the target material and the angle of incidence of the water cluster beam on the target. The phenomenon of charge formation and separation can be explained by the autoprotolysis of water molecules in clusters: H,O(aq)+N*(aq) i-OH-faq}. This reaction is enhanced by increasing the cluster collision energy. The difference between I+ and f_ seems to be connected with the different rates of neutralization of positive and negative ions in clusters by the surface. The presence of electrons in the scattered particle flow is explained by Auger neutralization of some af the cations.

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