We present results on Hahn echo experiments with a single molecular triplet electron spin. The surprising possibility of observing an echo phenomenon with an individual electron spin arises as a result of a spectral diffusion process of the magnetic resonance transition frequency in the course of the...
Ultra-fast multi-section MRI using gradient and spin echo (GRASE) imaging Fast magnetic resonance imaging uses combined gradient echoes and spin echoes. In each of one or more TR intervals, after an initial NMR RF nutation pulse, a sequence of 180° RF nutation pulses is used to refocus the...
An analytical model is developed to account for the data obtained as well as for the results of analogous two-pulse echo experiments. The results of a numerical calculation are further presented to assess the capability of the method to study spin-spin interactions....
Spin- ja:math Hahn echoes, generated by two in-phase pulses separated by a delay τ 2 greater than or equal to twice the duration of the FID, T FID , are derived by taking into account the first-order quadrupole interaction throughout the experiment, and the heteronuclear magnetic-dipole ...
1998). This result, together with the results of 23Na spin-echo decay measurements, have been taken as a strong argument against previously-proposed clustering models for the glass structure. 23Na dynamic angle spinning (DAS) NMR at two magnetic fields has been used to determine the chemical ...
Hahn Echo You mentioned that other pulses besides a 90°-180°combination can produce a spin echo. I don't see how this happens. Can you explain? It is indeed true that 90°and 180° pulses do not have to be used to generate a spin echo. In fact, pulses with any flip angles can...
Shioya S, Christman R, Ailion DC, Cutillo AG, Goodrich KC, Morris AH . In vivo Hahn spin-echo decay (Hahn- T 2 ) observation of regional changes in the time course of oleic acid lung injury . J Magn Reson Imaging 11 , 215-222 ( 2000 )...
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We present a theory to establish a relation between Hahn spin-echo of a spin-1/2 particle and quantum phase transitions in many-body systems. The Hahn echo is calculated and discussed at zero as well as at finite temperatures. On the example of XY model, we show that the critical points...
Focuses on the influence of magnetic fields of ferroliquid macroparticles on the attenuation of the Hahn spin echo-signal. Form of the ratio of the amplitude of Hahn's and Carr-Purcell's echo-signal; Empirical expression of the approximation of the dependence of solutions; Graph of the ...