Quadrupole effects in the electron spin echo from pairs of diphenylnitryl radicals

Conclusions This analysis of ESE modulation effects for DPN pairs indicates that the frequencies are those of quadrupole resonance for the nitrogen atoms in the DPN in the external magnetic field, and this has enabled us to determine the quadrupole splitting parameters. However, an exact calculation on the NQR transition frequencies in the partially oriented system requires a knowledge of the directions of the electric field gradient tensor axes, which cannot be derived from these experiments. For this reason, in a study of this type one must make the fullest possible use of data from other experiments or from quantum-chemical calculations, which should enable one to restrict the possible directions for the EFG tensor axes.Translated from Zhurnal Strukturnoi Khimii, Vol. 26, No. 1, pp. 43–48, January–February, 1985.     

A diamagnetic Mossbauer probe method for studying a solid-gas interface and related catalytic processes

The results of recent studies involving the application of diamagnetic Mossbauer dopant cations for the investigation of heterogeneous catalytic reactions are described. Possibilities for using the information contained in Mossbauer spectra to clarify the nature of active catalytic centers are discussed. It is shown that, in some cases, the catalytic tests allow the correctness of the chemical interpretation of spectral parameters of the dopant atoms under study to be verified.     

Using the Mössbauer spectroscopy of <Superscript>121</Superscript>Sb nuclei to differentiate the effects of Cr and Sb co-dopants on the photocatalytic activity of anatase-type polycrystalline TiO<Subscript>2</Subscript> powders

The rates of the photocatalytic decolorization of methyl orange solutions in the presence of anatase powders modified by Cr³⁺ and Sb⁵⁺ co-dopants are compared with allowance for data on the actual valence state of antimony in the catalyst, obtained using ¹²¹Sb Mössbauer spectroscopy. The reported results point to the catalytic activity of the Cr⁶⁺ ions formed to compensate for the Cr³⁺ charge deficit in antimony-free samples.     

On Disjointly Homogeneous Orlicz–Lorentz Spaces

Mathematical Notes - A characterization of disjointly homogeneous Orlicz–Lorentz function spaces $$\Lambda_{\varphi,w}$$ is obtained. It is used to find necessary and sufficient conditions...     

Some New Extrapolation Estimates for the Scale of Spaces

Using new extrapolation estimates for the - and -functionals of couples of limit spaces of the -scale , we introduce a class of extrapolation functors. A characterization of this class via the real interpolation method permits one to obtain new equivalent expressions for the norms in symmetric spaces close to and , which depend only on the -norms of a function.     

Lieb-Thirring inequality for L p norms

In this paper, we obtain the Lieb-Thirring inequality for L _p -norms. The proof uses only the standard apparatus of the theory of orthogonal series.     

Matrix Line in Pulsed Electron-Nuclear Double Resonance Spectra

The intense line in Mims and Davies electron-nuclear double resonance (ENDOR) spectra due to the hyperfine interactions of an unpaired electron with distant matrix nuclei is shown to originate from a simultaneous inversion of a large number of nuclear spins by a radiofrequency pulse. Theoretical expressions describing the matrix ENDOR effect are derived and verified experimentally.     

Refocused primary echo: A zero dead time detection of the electron spin echo envelope modulation

We report on the two-dimensional (2D) implementation of the refocused primary electron spin echo envelope modulation (ESEEM) technique, its theory and experimental application to a model system and a system of biological interest. This technique is virtually free of dead time along one time coordinate. The ESEEM obtained by integration of the 2D time-domain data of the refocused primary ESEEM over one of the time coordinates shows the intensity of the sum combination harmonics proportional to k² for k 1 and proportional to k for k 1 (k is a usual notation for the modulation amplitude factor). This feature, in combination with the adjustment of k by means of variation of the operational frequency of the spectrometer, was found to be very useful for detection of protons with distributed hyperfine interaction parameters situated close to the electron spin.     

Neutronographic investigation of the characteristics of phase transition in the alloy Ni3Mn,alloyed with small additions of aluminum and copper

The temperature dependence is studied of the extent of the long-range order and size of the domain in the alloy Ni₃Mn, alloyed with small additions (a few atoms percent) of aluminum and copper. It is shown that A1 stabilizes the superlattice of Ni₃Mn but Cu destroys it. In alloys of Ni₃(Mn, Al) a monotonic effect is observed of the aluminum concentration in the alloy on the nature of the phase transition.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 16–25, November, 1973.