Measurement of small spin-spin splittings in the presence of chemical exchange: case of deuteriated water.
A new implementation of a described data processing for measuring small scalar coupling constant J is proposed. It is applied particularly to situations where the coupling constant is around the linewidth at half-height, and in the presence of chemical exchange. This modified data processing uses only a simple "one-pulse" experiment instead of a series of spin echoes experiments required by the previous processing. The FID recorded in the one pulse experiment is used by a reconstitution program to generate a set of signals, which are analyzed in the time domain to obtain a spectrum where the scalar coupling constant is apparently multiplied by n+1, where n is positive. The new processing is tested with simulated spectra. The coupling constant between proton and deuterium is measured in the proton spectrum of a solution of 80% of D(2)O and 20% of H(2)O. It was found to be J=1.54+/-0.01 Hz.
Mahi
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Université Claude Bernard Lyon I, Batiment OMEGA UFR GEP, 43 Boulevard du 11 Novembre 1918, Villeurbanne Cedex 69622, France. mahi.hassan@voila.fr
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D003903:Deuterium / Q000737:chemistry*; D001330:Electronic Data Processing; D005583:Fourier Analysis; D007474:Ion Exchange; D008433:Mathematics; D014867:Water / Q000737:chemistry
D014867:Water; D003903:Deuterium