University of Ottawa NMR Facility Web Site

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Tuesday, February 12, 2008

Field Dependence of 13C Line Shapes for Nitrogen Bearing Carbons in the Solid State

The frequency separation between the two peaks in the 1:2 doublets typically observed for 13C nuclei bonded to 14N in 13C CPMAS spectra is inversely dependant on the strength of the magnetic field. As a result narrower resonances are observed for nitrogen bearing carbons at higher field. The figure below shows the 13C CPMAS spectrum of D,L-alanine acquired on both a 200 MHz and a 500 MHz instrument.

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