“…Attempts have been made by a great many workers, in several fields of research, to develop adequate methods of hydrocarbon analysis. These include ultraviolet and infrared absorption spectra (3, 19,22,24,25) and Raman spectra (9,14,15,26,32), and more recently the mass spectrograph has been applied to the solution of ihi3 problem. Rosenbaum, Grosse, and Jacobson (26) in their work on the Raman spectra of the nine isomeric heptanes, report that analysis of close to 50-50 binary mixtures gave results within 5%.…”