Compară metode

	COSY	ATR-FTIR	Secvența spin-echo (ecou de spin)
Domeniu	Spectroscopie	Spectroscopie	Spectroscopie
Familie	Process / pipeline	Process / pipeline	Process / pipeline
Anul apariției	1976	1961	1950
Autorul original	Wüthrich Kurt	Joop Fahrenfort	Erwin Hahn
Tip	Two-dimensional pulse sequence	Vibrational spectroscopy technique	Spectroscopic pulse sequence
Sursa seminală	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.	Harrick, N. J. (1960). Study of physics of internal reflection from metals. Journal of Physics and Chemistry of Solids, 13(2), 143-155.	Hahn, E. L. (1950). Spin echoes. Physical Review, 80(4), 580-594.
Denumiri alternative	COSY NMR, 2D COSY, 1H-1H COSY	ATR-IR, attenuated total reflectance, FTIR spectroscopy	CPMG pulse sequence, spin-echo NMR
Înrudite	4	3	4
Rezumat	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.	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.