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- W2105496614 abstract "Abstract Target current density effects in secondary emission of positively-charged sputtered clusters from an ion-bombarded polycrystalline aluminium surface have been investigated for various primary Cd+ ion energies. For each cluster type, at medium target current densities (Jp : 0—350 μA/cm2), apart from the presence of the expected linear term in the I+ s α Jp curves, there is a square law term, depicting that some fraction of the pre-emitted neutral clusters gets ionized in vacuum above the target surface. Thus, a sum of these two terms constitutes the total cluster ion current which shows a non-linear dependence on the target current density. At higher target current densities (350 μA cm−2—1.05 mA cm−2), in addition to the parabolic effect, a higher order non-linearity comes into play and the net cluster ion current I + s , measured as a function of target current density within the Ip range concerned, can be expressed in terms of our previously proposed semi-empirical formula I+ s = C.Ip + D.I2 p + F.In p , which was earlier found to be applicable in case of single and double charged secondary monomers. A higher power (n > 2) dependence has been observed here for the first time in case of cluster ion emission, suggesting chemical enhancement of secondary clusters. Our present observations seem to support ‘direct emission model’ even for small metal clusters—a proposition which is in apparent contradiction to the current notion in this field, i.e. vacuum recombination of individual atoms in small cluster formation." @default.
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- W2105496614 date "1994-04-01" @default.
- W2105496614 modified "2023-10-18" @default.
- W2105496614 title "Target current density effects in al-cluster ion emission" @default.
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- W2105496614 doi "https://doi.org/10.1080/10420159408219759" @default.
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