قارن الطرق

	نبضة صدى الدوران في الرنين المغناطيسي النووي	HSQC
المجال	علم الطيف	علم الطيف
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1950	1980
صاحب الطريقة	Erwin Hahn	Anil Kumar
النوع	Spectroscopic pulse sequence	Heteronuclear correlation sequence
المصدر التأسيسي	Hahn, E. L. (1950). Spin echoes. Physical Review, 80(4), 580-594.	Bodenhausen, G., & Ruben, D. J. (1981). Natural abundance nitrogen-15 NMR by enhanced heteronuclear spectroscopy. Chemical Physics Letters, 69(2), 185-189.
الأسماء البديلة	CPMG pulse sequence, spin-echo NMR	HSQC NMR, 1H-13C HSQC, heteronuclear correlation
ذات صلة	4	4
الملخص	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.	Heteronuclear Single-Quantum Coherence (HSQC) is a 2D NMR technique that correlates proton and carbon-13 (or other heteronuclei) chemical shifts through one-bond coupling constants (1JHX). Developed in the early 1980s, HSQC rapidly became the workhorse of structural chemistry because it directly maps which carbons bear which protons, providing a comprehensive view of carbon skeleton connectivity and substitution patterns.