Abstract
A new method for the automated phasing of n.m.r. spectra is described. The basis of the automation is that the software performs the phasing in the same fashion as a trained n.m.r. operator rather than using mathematical relationships between absorptive and dispersive spectra. The method is illustrated with the processing of the 13C n.m.r. spectrum of a catalytic cracking feedstock. The software readily phased the spectrum even though the spectrum had very broad features and a significant baseline correction. The software performed well even when the time-domain data was left-shifted to introduce a large first-order phase error. The method was applied to measure the percentage of unsaturated carbon in hydrocarbons. Extensive tests were performed to compare automated processing with manual processing for this application; the automated method was found to give both better precision and accuracy. The method can be easily tailored to many other types of analyses.
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