International Tomography Center
Siberian Branch of Russian Academy of Sciences

Main achievements

One of the most important results, which has been achieved in collaboration with colleagues from ICKC SB RAS, is the development of the formalism of the integral encounter theory of multistage reactions, which is currently the most general approach to the description of the kinetics of complex diffusion-controlled reactions in liquid phase.

 The following most important results in the fields of spin chemistry and spin hyperpolarization have been obtained: the role of level anti-crossings in coherent polarization transfer and spin relaxation has been established and new methods of spin polarization transfer have been elaborated; the most general description of the magnetic field dependence of PHIP has been developed; a relation has been established between the amplitudes of CIDNP and spin density distribution in transient radical pairs; a general approach to CIDNP in liquids and solids has been proposed based on the analysis of spin level crossings and anti-crossings of radical pairs. 

In collaboration with Laboratory of Radical Photochemical Reactions, new approaches have been developed for manipulating nuclear spin polarization using adiabatically switched RF fields. A strong contribution has been made to the methodology of long-lived states in NMR – new methods have been proposed for generating hyperpolarized long-lived states and a universal approach for generation and selective detection of long-lived states has been devised. New results have been obtained in the field of Dynamic Nuclear Polarization (DNP): theory of pulsed DNP has been developed, molecular mechanism of the Overhauser effect in solids has been proposed. A consistent treatment of the spin dynamics of NV centers in diamond crystals under the action of switched external magnetic fields has been developed.

A theory of thermally induced magneto-structural phase transitions in polymer chains containing  Jahn-Teller exchange clusters has been proposed. Quantum chemical calculations of thermal transformation of exchange integrals have been performed for a family of coordination compounds named «Breathing crystals».