Ultrashort pulses in structural analysis of diamond layers with angstrom resolution.

X-ray crystallography is commonly used to determine crystal structures, whether continuous or ultrashort x rays are used. In this paper, it is shown that using only ultrashort pulses, it is possible to determine interplanar spacing in diamond layers, the distance between which can be only a few angstroms. The results obtained can be extended, with further development of the presented theory, to determine 3D objects in the crystal structure, the dimensions of which can be only a few angstroms.

Effects of lipid extraction on stable isotope ratios of carbon and nitrogen in muscles of freshwater fish.

The extraction of lipids by the Folch method from the muscles of all the fish studied led to statistically significant differences in the values of N. At the same time, lipid extraction led to a statistically significant increase in C in pike and roach, and to a statistically insignificant decrease in C in perch and bream. Thus, lipid extraction cannot serve as a universal method of sample preparation for the analysis of the isotopic composition of carbon (C/C) and nitrogen (N/N) in fish muscles.

Investigation of structural and reflective characteristics of short-period Mo/BC multilayer X-ray mirrors.

The results of a study of the structural and reflective characteristics of short-period multilayer X-ray mirrors based on Mo/BC at wavelengths 1.54 Å, 9.89 Å and 17.

Layer-controlled evolution of electron state in the silicene intercalation compound SrSi.

Silicene, a Si-based analogue of graphene, holds a high promise for electronics because of its exceptional properties but a high chemical reactivity makes it a very challenging material to work with. The silicene lattice can be stabilized by active metals to form stoichiometric compounds MSi. Being candidate topological semimetals, these materials provide an opportunity to probe layer dependence of unconventional electronic structures.