Single-Pulse Echo and Its Secondary Signals in Two-Level Spin Systems |
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| Authors: | G G Fedoruk |
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| Institution: | (1) A. N. Sevchenko Institute of Applied Physical Problems, Belarusian State University, Minsk, Belarus;;(2) Institute of Physics, University of Szczecin, 15 Wielkopolska Str., 70-451, Szczecin, Poland |
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| Abstract: | The dependences of the amplitudes of single- and two-pulse spin echoes and their secondary signals in NMR (protons of glycerin in an inhomogeneous magnetic field) in the exciting-pulse repetition period T
r have been compared. The difference in origin of the primary and secondary signals of a single-pulse echo in a two-level spin system has been confirmed. It is shown that only a primary single-pulse echo observed when T
r > T
1 (T
1 is the spin lattice relaxation time) results from single-pulse excitation. The secondary single-pulse echo signals are observed for T
r < T
1 and are due to the multiphase formation mechanism. The results obtained for magnetically ordered substances are analyzed. Based on these data, it was inferred earlier that primary and secondary single-pulse echo signals were formed by one and the same multiphase mechanism. |
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| Keywords: | NMR proton inhomogeneous broadening single-pulse echo secondary echo two-level spin system |
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