GENERAL, THEORY ON SPIN-ECHOES FOR ANY COMBINATION OF ANY NUMBER OF PULSES INTRODUCTION OF A SIMPLE 'SPIN-ECHO DIAGRAM'

摘要

The effects of diffusion damping of spin-echo amplitudes were first treated by Hahn . An improvement of Hahn' s averaging procedure was suggested by Das and Saha . Their theory, however, as is shown here, contains an error. This is corrected, and the revised theory is shown to give for a special case the same result as obtained by different methods by Carr and Purcell and by Torrey . Furthermore the revised theory is extended to account for any combination of pulses, and it is shown that the results are conveniently summarized in a simple "spin-echo diagram".