Compară metode
Examinează metodele selectate una lângă alta; rândurile care diferă sunt evidențiate.
| Secvența spin-echo (ecou de spin)× | NOESY× | |
|---|---|---|
| Domeniu | Spectroscopie | Spectroscopie |
| Familie | Process / pipeline | Process / pipeline |
| Anul apariției≠ | 1950 | 1981 |
| Autorul original≠ | Erwin Hahn | Richard Ernst |
| Tip≠ | Spectroscopic pulse sequence | Two-dimensional pulse sequence |
| Sursa seminală≠ | Hahn, E. L. (1950). Spin echoes. Physical Review, 80(4), 580-594. DOI ↗ | Aue, W. P., Bartholdi, E., & Ernst, R. R. (1976). Two-dimensional spectroscopy. Application to nuclear magnetic resonance. The Journal of Chemical Physics, 64(5), 2229-2246. DOI ↗ |
| Denumiri alternative≠ | CPMG pulse sequence, spin-echo NMR | NOE spectroscopy, 2D NOESY, NOE NMR |
| Înrudite≠ | 4 | 3 |
| Rezumat≠ | The spin-echo is a fundamental nuclear magnetic resonance (NMR) pulse sequence technique introduced by Erwin Hahn in 1950. It uses a 90-degree radiofrequency pulse followed by a 180-degree refocusing pulse to create an echo, effectively reversing the effects of magnetic field inhomogeneities and allowing accurate measurement of spin relaxation properties. This technique is essential in modern NMR spectroscopy for both one-dimensional and multidimensional experiments. | Nuclear Overhauser Enhancement Spectroscopy (NOESY) is a 2D NMR technique that detects through-space dipolar coupling between protons, rather than through-bond scalar coupling. Introduced by Macura and Ernst in 1981, NOESY reveals which protons are spatially close in the three-dimensional structure, independent of bonding connectivity. This makes NOESY invaluable for determining molecular conformation, assigning stereochemistry, and elucidating protein folds. |
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