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| Spektroskopi ATR-FTIR× | Gema Putaran NMR× | |
|---|---|---|
| Bidang | Spektroskopi | Spektroskopi |
| Keluarga | Process / pipeline | Process / pipeline |
| Tahun asal≠ | 1961 | 1950 |
| Pencetus≠ | Joop Fahrenfort | Erwin Hahn |
| Tipe≠ | Vibrational spectroscopy technique | Spectroscopic pulse sequence |
| Sumber perintis≠ | Harrick, N. J. (1960). Study of physics of internal reflection from metals. Journal of Physics and Chemistry of Solids, 13(2), 143-155. link ↗ | Hahn, E. L. (1950). Spin echoes. Physical Review, 80(4), 580-594. DOI ↗ |
| Alias≠ | ATR-IR, attenuated total reflectance, FTIR spectroscopy | CPMG pulse sequence, spin-echo NMR |
| Terkait≠ | 3 | 4 |
| Ringkasan≠ | Attenuated Total Reflectance (ATR) Fourier Transform Infrared (FTIR) spectroscopy is a variant of conventional FTIR that measures infrared absorption through evanescent-wave interrogation of samples in direct contact with a high-refractive-index crystal. Developed by Harrick and Fahrenfort in the 1960s, ATR-FTIR is now the dominant form of FTIR spectroscopy, enabling rapid, non-destructive characterization of organic compounds, polymers, coatings, and biological materials without extensive sample preparation. | 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. |
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