Doublets, hydrocarbon-sulfur

Tables II and III are presented with slightly different formats to illustrate the scope of the data. Spectra were run at about 40,000 resolving power. Approximately 500 individual carbon-number homologs were identified in the spectrum of the heavy liquid, 1000 in that of the asphaltene (12). Total ionization in both cases was about 1,000,000 so that the homologs with intensity values ca. 100 represent approximately 100 ppm concentration. As indicated in the tables, the 40,000 resolving power was insufficient to separate hydrocarbon/sulfur doublets. The identifications given are based on mass measurement and chemical considerations. This is possible only in some cases. Spectra run at 80,000 resolving power showing separated sulfur/hydrocarbon doublets are reported elsewhere (13, 14).

In addition to the above calculations, our computer programs also separate unresolvable sulfur and hydrocarbon components (10). This step is carried out before calculating the concentrations. It is required because of the inherent difficulties in resolving certain hydrocarbon/ sulfur doublets even with an instrumental resolving power of ca. 100,000. 

---