เปรียบเทียบวิธี

	เทคนิคสปิน-เอคโคของ NMR	COSY	FT-ICR Mass Spectrometry
สาขาวิชา	สเปกโทรสโกปี	สเปกโทรสโกปี	สเปกโทรสโกปี
ตระกูล	Process / pipeline	Process / pipeline	Process / pipeline
ปีกำเนิด	1950	1976	1974
ผู้ริเริ่ม	Erwin Hahn	Wüthrich Kurt	Alan Marshall
ประเภท	Spectroscopic pulse sequence	Two-dimensional pulse sequence	Mass spectrometry technique
แหล่งต้นตำรับ	Hahn, E. L. (1950). Spin echoes. Physical Review, 80(4), 580-594.	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.	Comisarow, M. B., & Marshall, A. G. (1974). Fourier transform ion cyclotron resonance spectroscopy. Chemical Physics Letters, 25(2), 282-283.
ชื่อเรียกอื่น	CPMG pulse sequence, spin-echo NMR	COSY NMR, 2D COSY, 1H-1H COSY	FT-ICR-MS, Fourier Transform ICR, ICR mass spectrometry
ที่เกี่ยวข้อง	4	4	4
สรุป	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.	Fourier Transform Ion Cyclotron Resonance (FT-ICR) mass spectrometry is an advanced analytical technique that combines magnetic confinement of ions with Fourier transform data processing to achieve exceptional mass accuracy and resolution. Developed by Comisarow and Marshall in 1974, FT-ICR-MS enables the determination of exact masses and elemental compositions of complex molecules, making it invaluable for environmental chemistry, metabolomics, petroleum characterization, and structural elucidation of unknowns.