The angular and temperature dependences of single crystal ESR spectra at X-band frequency of quasi-1D spin 1/2 antiferromagnetic zigzag chain system β-TeVO₄ are reported. Two resonance components in the ESR spectrum have been detected: a weak narrow resonance on the top of the extremely broad signal. The narrow line might be due to an impurity, the characteristics of the broad absorption do not correlate with a picture of the typical behavior for the V⁴⁺ ions (S = 1/2) with a square pyramidal environment. It was found that at low temperatures the divergence of the spin susceptibility and linewidth of the observed excitations can be due to a realization of three dimensional magnetic ordering.

In the present paper the applicability of a structure determination for a four amino acid residues containing oligopeptide N-Ac-Ser-Phe-Val-Gly-OMe was investigated. The spatial structure of the "tetrapeptide (N-Ac-Ser-Phe-Val-Gly-OMe) - sodium dodecyl sulfate micelle" complex in aqueous solution was studied by 2D nuclear magnetic resonance (NMR) spectroscopy. The complexation was confirmed NOEs signs and values in the presence of sodium dodecyl sulfate. The spatial structure of the tetrapeptide in the complex was determined by 2D NOESY NMR spectroscopy. In present paper by the comparison ¹³C NMR chemical shifts was shown that tetra peptide's spatial structure in solid state and tetrapeptide structure in "peptide-micelle" complex are identical.

In the present work we show with electron paramagnetic resonance (EPR) spectroscopy that in the process of the mechanochemical doping of the CaF₂ fine particles with Er³⁺ and Yb³⁺ ions the cubic symmetry rare-earth (RE) ion centers are formed with the concentration proportional to the particles surface in the sample. Amount of the mechano-doped RE-ion centers is proportional to η^α, where η is the weight fraction of the RE fluoride in the initial mixture and α~0.8. Cubic symmetry centers dominate in the EPR spectrum up to η=0.1. A hypothesis of the cubic RE-ion center formation is proposed according to which its origin is associated with the presence of the ideal cleavage planes in the CaF₂ crystals: during the mechano-doping a considerable fraction of the rare-earth ions is trapped between the cleavage planes of the agglomerating particles, thereby getting into the crystal field of the cubic symmetry.