Toroidal response in magnetic resonance

Toroidal response of a nuclear spin system to the pulse of a uniform ratio frequency magnetic field is considered. It is shown that the toroidal moment of the system induces an electrical field response which may be measured together with the magnetic field response (that is induced by the magnetic moment of the system and it is usually observed in NMR). An example of a system of three nuclear spins is examined in detail by the direct solution of the Schroedinger equation. Both responses-magnetic and toroidal-are evaluated and compared with each other. The general approach based on SO(4)group representation of spin dynamics is also used. It allows one to take into consideration the toroidal moment of the system and gives the possibility to clarify the origin of toroidal response. The general scheme of the device for registering the electric component of the response is discussed