V. I. Tarkhanov
Saint-Petersburg State Polytechnic University
A dynamical approach in combination
with the proper geometric Clifford algebra is proposed to describe information
flows formed during resonance application of rf magnetic field pulses to
an inhomogeneously broadened two-level nuclear spin system. It permits
one to introduce a notion of vector data medium and to follow spin system
evolution in four different ways, which are connected through the formalism
of Cayle—Klein parameters. The notion of coherence is generalized to include
differences in space orientations and resonance frequencies for elements
of the vector data medium. It is shown that information about pulse parameters
of an excitation sequence is written in a spin system with manifold redundancy
and by no means is always available for reading. The approach allows one
to calculate all information flows which are formed in an arbitrary inhomogeneously
broadened two-level system under conditions of any multipulsed experiment
as well as necessary and sufficient conditions for their reading for a
given way of detection.