Spin echo decay. Hahn-echo decay of the exchange-coupled nuclear spins in solids. Exchange-coupled spins of T203l and T205l isotopes in thallium chloride TlCl and thallium tantalum sulfide TlTaS3.doi:10.1016/j.ssnmr.2012.02.008N.A. Sergeev...
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....
In particular, it is shown that the attenuation down the echo train is due to a varying contribution from both T1 and T2 processes, as well as diffusion. With long T1's and slow diffusion, the decay of the echoes approximates T2. 展开 ...
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 ...
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 )...
We studied the time course of changes in the Hahn spin-echo decay (Hahn-T2) in lungs of spontaneously breathing living rats at 1 hour, 3 hours, and 7 days following oleic acid injection. Motion artifacts were minimized by using the motion-insensitive interleaved rapid line scan (ILS) ...
The existence of a Hahn echo decay that is shorter than the true T2 and one that has an exponential dependence on the cube of the echo time indicates the presence of slow motions. The diffusion coefficient D can be obtained from the rate of decay of the Hahn echo. Similar values for D...
The results of Hahn (two-pulse) and stimulated (three-pulse) photon-echo decay measurements in the lowest 2A ← 2A electronic transition of triphenylmethyl in triphenylamine are reported and discussed. From the Zeeman effect on the photon-echo relaxation behaviour we conclude that hyperfine and ...
The modulation of Hahn echo intensity in solutions due to chemical exchange is observed in pulse EPR experiments. An analysis of the Hahn echo intensity decay allows for the quantitative determination of the chemical exchange rate and solution pH value....
Here, we study the behavior of the Hahn-echo decay in rocks with grains much larger and smaller than the average dephasing length, which is typically of the order of a few microns. It is shown that the decay in these two cases is qualitatively different. For coarse-grained rocks, the ...