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 1444.   ---------------.  [HOFER, L. J. E., AND PEEBLES, W. C.] X-Ray Diffraction Patterns of Solid Aromatic Hydrocarbons.  Anal. Chem., vol. 23, No. 5, 1951, pp. 690-695.

       Investigations into the basic aspects of coal hydrogenation have led to the preparation of a series of highly purified solid aromatic hydrocarbons that are of interest to the coal-tar, fuel, and other industries and to the field of medicine.  For the positive identification of solid crystalline aromatic hydrocarbons X-ray diffraction analysis is proposed.  X-ray powder diffraction patterns of 59 hydrocarbons have been obtained using Fe-target radiation.  Enough impurities to lower the melting point by as much as 15° C. do not appreciably modify the diffraction patterns.  The patterns are very characteristic; those of closely related compounds and even isomers are unique and can readily be identified.