विधियों की तुलना करें
चुनी हुई विधियों की आमने-सामने समीक्षा करें; भिन्नता वाली पंक्तियाँ रेखांकित हैं।
| NMR Spin-Echo× | COSY× | |
|---|---|---|
| क्षेत्र | स्पेक्ट्रोस्कोपी | स्पेक्ट्रोस्कोपी |
| परिवार | Process / pipeline | Process / pipeline |
| उद्भव वर्ष≠ | 1950 | 1976 |
| प्रवर्तक≠ | Erwin Hahn | Wüthrich Kurt |
| प्रकार≠ | Spectroscopic pulse sequence | Two-dimensional pulse sequence |
| मौलिक स्रोत≠ | 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 ↗ |
| उपनाम≠ | CPMG pulse sequence, spin-echo NMR | COSY NMR, 2D COSY, 1H-1H COSY |
| संबंधित | 4 | 4 |
| सारांश≠ | 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. | Correlation Spectroscopy (COSY) is a two-dimensional NMR technique that correlates proton chemical shifts through scalar coupling (J-coupling), revealing which protons are magnetically coupled and hence bonded through multiple bonds. Developed by Aue, Bartholdi, and Ernst in 1976, COSY became one of the most important tools in structural elucidation, enabling chemists to map out proton connectivity patterns and deduce molecular topology without isotopic labeling. |
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