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- W2314226317 abstract "This paper describes a method to study the reactivity of neutral clusters at single-collision-like conditions, which enables the determination of absolute numbers for the reaction probability (S) in a collision. A beam of clusters is produced in a laser vaporization source and skimmed and passes a cell with reactive gas, in which the clusters experience one or a few collisions with the gas molecules. The reaction products are detected with laser ionization and mass spectrometry. The depletion of pure clusters and the appearance of products are evaluated with a statistical model providing S for the first, second, etc., molecule adsorbed. The O2 and D2 reactivity of Fen, Con, and Cun has been investigated for clusters in the approximate size range 10−60 atoms. The oxidation of transition metal clusters, here exemplified by Con and Fen, shows a simple S vs n dependence, where S increases almost monotonically as n increases from 10 to 20, while for larger n, S remains high and almost constant; S ≈ 0.7 for both Fen and Con. The low O2 reactivity measured for the small transition metal clusters may be an effect of the products having a short lifetime due to the high exothermicity of the oxidation reaction. For copper clusters there are repeated minima in the O2 reactivity appearing at cluster sizes that are known to have high IP and closed electronic shells. Con is much less reactive toward D2 than O2, and S for D2 on Con exhibits large size to size fluctuations. Cun and small Fen appear unreactive (detection limit S ≈ 0.02) toward D2, whereas the larger Fen (n ≥ 23) react with a low probability." @default.
- W2314226317 created "2016-06-24" @default.
- W2314226317 creator A5024333048 @default.
- W2314226317 creator A5052721934 @default.
- W2314226317 creator A5069983342 @default.
- W2314226317 date "1996-01-01" @default.
- W2314226317 modified "2023-10-02" @default.
- W2314226317 title "Reactivity of Fe<i><sub>n</sub></i>, Co<i><sub>n</sub></i>, and Cu<i><sub>n</sub></i> Clusters with O<sub>2</sub> and D<sub>2</sub> Studied at Single-Collision Conditions" @default.
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- W2314226317 doi "https://doi.org/10.1021/jp960889z" @default.
- W2314226317 hasPublicationYear "1996" @default.
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