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Abstract  

A historical survey of the author's contribution to the progress of solid state hot atom chemistry including more personal commentaries is presented.

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Abstract  

Hot Atom Chemistry is presented as a field which has been unable to define its border and to solve its own problems.

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Abstract  

DIMOTAKIS and his group have published some papers in which they report for a number of target substances (e.g. [Co(en)3](NO3)3) oscillatory annealing instead of smooth annealing as usually assumed. They discuss their results following the predator-prey model of LOTKA-VOLTERRA. These experiments were repeated. No indication for oscillatory annealing was observed. As expected, a fitted non-oscillatory curve runs-considering the standard deviations of ±0.5%-through only approximately 68% of the experimental points as predicted by the statistical nature of radioactivity measurements.

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The properties of weighted averages as linear estimators of a regression function and its derivatives are investigated for the fixed design case. Results on weak consistency and on universal consistency are derived, using a modification of the definition of Stone [10]. As examples we consider kernel estimates and weighted local regression estimators and show that the general results apply.

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Chemical effects of nuclear transformations in mixed potassium hexahalogenometallates(IV), K2MXnY6−n

II. Chemical effects of the35Cl(n, γ)36Cl,37Cl(n, γ)38Cl,79Br(n, γ)80mBr and81Br(n, γ)82Br nuclear processes in mixed potassium hexabromochlororhenates(IV), K2ReBrnCl6−n, and osmates, K2OsBrnCl6−n

Journal of Radioanalytical and Nuclear Chemistry
Authors:
H. Müller
and
I. Hagenlocher

Abstract  

Damage initiated by halogen recoil atoms in mixed hexabromochlorometallates has been evaluated with the help of the impact-induced multiple Ligand Abstraction (IMULA) model. The essential reactions within the scope of the model are (1) primary retention for recoil atoms with energies below some threshold of displacement energy, (2) halide-halide substitution reactions (billiard ball reactions), (3) reactions in which two or more halide ligands are displaced with subsequent reoccupation of the vacancies by adjacent halides and (4) formation of interstitials which form free halide during the dissolution of the irradiated substances. It was found that for all recoil atoms and both potassium hexabromochlorometallates the contributions of the different reaction channels are very similar: (1) 4–18% (2) 40–50%, (3) 25–30% and (4) 12–20% These results do not differ essentially from results so far obtained in mixed crystal systems.

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