Influence of surface roughness on the efficiency of X-ray mirrors with whispering gallery modes

Crystallography Reports - The influence of roughness on the propagation of an X-ray beam along a concave surface in the whispering gallery mode has been investigated. The transfer equation of beam...     

Catalytic hydrogenation of furfurylideneacetone

The stepwise character of the hydrogenation of furfurylideneacetone on a Raney nickel catalyst at 50° C and atmospheric pressure was investigated. It is shown that the intermediate-1-(-furyl)-3-butanone — is primarily hydrogenated to 1-(-tetrahydrofuryl)-3-butanone.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 291–284, March, 1972.     

Kinetics of oxidative coupling of thiophene in the presence of Pd(OAc)2

The kinetics of oxidative coupling of thiophene to bithiophene in the presence of Pd(OAc)₂ in acetic acid solution has been studied at 60–80°C. The mechanism of the reaction is discussed.

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Pd (OAc)₂ HOAc 60–80°. .

     

Reactivities of some carbonyl compounds of the furan series in catalytic hydrogenation

The rate of hydrogenation of some carbonyl compounds of the furan series on Raney nickel-titanium-aluminum and copper-chromium oxide catalysts decreased in proportion to the decrease in the frequency of the absorption band of the C=O bond.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 447–449, April, 1983.     

Model approach to solving the inverse problem of X-ray reflectometry and its application to the study of the internal structure of hafnium oxide films

The key features of the inverse problem of X-ray reflectometry (i.e., the reconstruction of the depth profile of the dielectric constant using an experimental angular dependence of reflectivity) are discussed and essential factors leading to the ambiguity of its solution are analyzed. A simple approach to studying the internal structure of HfO₂ films, which is based on the application of a physically reasonable model, is considered. The principles for constructing a film model and the criteria for choosing a minimal number of fitting parameters are discussed. It is shown that the ambiguity of the solution to the inverse problem is retained even for the simplest single-film models. Approaches allowing one to pick out the most realistic solution from several variants are discussed.