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Reaction Mechanism of the Exchange Reaction between CuCl and BaO Studied by Time-Resolved X-ray Absorption Spectroscopy

✍ Scribed by Holger Rumpf; Joachim Janssen; Hartwig Modrow; Karoline Winkler; Josef Hormes

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
308 KB
Volume
163
Category
Article
ISSN
0022-4596

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✦ Synopsis

The solid state reaction 2CuCl؉BaO PCu 2 O؉BaCl 2 has been examined in situ using energy-dispersive X-ray absorption 5ne-structure spectroscopy (DXAFS). A high time resolution on the order of seconds between two Cu K-XANES spectra has been achieved by this experimental setup. The spectra suggest that the transformation of CuCl to Cu 2 O is preceded by an unidenti5ed, intermediate state. Fingerprint methods as well as principal component analysis have been applied, which con5rm the formation of exactly one new intermediate phase. The nature of this phase remains unidenti5ed and could not be elucidated by the experimental investigations.

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The temperature dependence of the rate constant for the exchange reaction between oxygen atoms and dioxygen molecules has been studied using the oxygen isotopes and . The reaction was studied by VIS-photolysis of ozone in the presence of isotopic 16 18 O O dioxygen and with nitrogen as a bath gas a