The Nitrogen-15 heteronuclear single quantum coherence version of this technique is commonly applied to proteins, and the Karplus equation can be used to find torsion angles from the results of it.  
The Nitrogen-15 heteronuclear single quantum coherence version of this technique is commonly applied to proteins, and the Karplus equation can be used to find torsion angles from the results of it.  A two-dimensional Fourier version of this technique was developed by Jean Jeneer in the COSY experiment, and another two-dimensional variant uses the Overhauser effect.  Spin-spin coupling results in the splitting of peaks in this technique, which uses TMS as a standard.  It plots the intensity of a signal against the relative difference in the Larmor precession of the nucleus and the standard, which is called the chemical shift.  FTP, name this type of spectroscopy that applied a magnetic field to a sample, usually abbreviated NMR.
The Nitrogen-15 heteronuclear single quantum coherence version of this technique is commonly applied to proteins, and the Karplus equation can be used to find torsion angles from the results of it.  
{Nuclear Magnetic} {Resonance} (or {NMR} before mention)